You ate 4/12 of the pizza your family bought for dinner. Your brother ate 3/12 of the pizza. Which equation represents the fraction of pizza both you and your brother ate?

The percentiles for the standard normal distribution

a. 0.93

b. -0.88

c. 0.67

d. -0.65

e. -1.28

To determine the percentiles for the standard normal distribution, use the standard normal distribution table. Percentiles for standard normal distribution are given by the standard normal distribution table.

The standard normal distribution is a special type of normal distribution with a mean of 0 and a variance of 1.

Step 1: Write down the given percentiles as a decimal and round to two decimal places.

For example, for the 81st percentile, 0.81 will be used.

Step 2: Use the standard normal distribution table to find the corresponding z-score.

Step 3: Round off the obtained answer to two decimal places.

a) 81st percentile:

The area to the left of the z-score is 0.81.

The corresponding z-score is 0.93.

Hence, the 81st percentile for the standard normal distribution is 0.93.

b) 19th percentile:

The area to the left of the z-score is 0.19.

The corresponding z-score is -0.88.

Hence, the 19th percentile for the standard normal distribution is -0.88.

c) 76th percentile:

The area to the left of the z-score is 0.76.

The corresponding z-score is 0.67.

Hence, the 76th percentile for the standard normal distribution is 0.67.

d) 24th percentile:

The area to the left of the z-score is 0.24.

The corresponding z-score is -0.65.

Hence, the 24th percentile for the standard normal distribution is -0.65.

e) 10th percentile:

The area to the left of the z-score is 0.10.

The corresponding z-score is -1.28.

Hence, the 10th percentile for the standard normal distribution is -1.28.

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Answer:

The perimeter is the sum of the lengths of all the sides of a polygon. Thus, the perimeter of this quadrilateral is:

(10a-6) + (7a+4) + (7a+4) + (10a-6)

Simplifying the expression:

= 34a - 4

Therefore, the perimeter of the quadrilateral is 34a - 4.

A tangent vector of unit length at the point with the given value of the parameter t. r(t) = 2 sin(t)i + 3cos(t)j , t= π/6 is r'(t) = √3 i +3/2 j.

Differentiation:

Differentiation is the rate of change of one quantity relative to another. Velocity is calculated as the rate of change of distance over time. The speed at each instant is different from the calculated average. Speed, like grade, is nothing more than the instantaneous rate of change in distance over a period of time.

The ratio of a small change in one quantity to a small change in another quantity as a function of the first quantity is called differentiation.

An important concept in calculus focuses on the differentiation of functions. The maximum or minimum of a function, the speed and acceleration of a moving object, and the tangent to a curve are all determined by differentiation. If y = f(x) is differentiable, then the differential is expressed by f'(x) or dy/dx.

According to the Question:

Given that:

r(t) = 2sin(t)i + 3 cos(t)j,

and, t =π/6

Now,

Differentiating with respect to t, we get:

    r'(t) = [tex]2\frac{d}{dt}sin(t) + 3 \frac{d}{dt} cos(t)[/tex]

⇒  r'(t) = 2cos(t) + 3 sin(t)

Putting t = π/6, we get:

   r'(t) = 2cos(π/6) + 3 sin(π/6)

⇒ r'(t) = 2×√3/2 + 3× 1/2

⇒ r'(t) = √3 + 3/2

Writing the equation in the vector form:

r'(t) = √3 i +3/2 j

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The height of the triangle is 1.12 units (rounded to two decimal places).

The height of a triangle is the perpendicular distance from the base of the triangle to the opposite vertex. In other words, it is the length of the line segment that is perpendicular to the base and passes through the opposite vertex.

We can use the formula for the area of a triangle:

Area = (1/2) * base * height

And since we know the values of the base (b) and the area (a), we can rearrange the formula to solve for the height (h):

h = (2a) / b

Plugging in the values of a and b:

h = (2 * 14) / 25

h = 28 / 25

Therefore, the height of the triangle is 1.12 units (rounded to two decimal places).

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Using binomial theorem we can expand the equation but We are not given the value of a or n, so we cannot determine c exactly.

Integers are real numbers that only comprise positive and negative whole integers as well as natural numbers. Because of rational and irrational numbers, real numbers may include fractions, whereas integers cannot.

A real number is a quantity in mathematics that may be expressed as an infinite decimal expansion. Real numbers, as opposed to natural numbers such as 1, 2, 3,..., which are generated from counting, are used in measures of continually changing quantities such as size and time.

by applying the binomial theorem:

[tex](1 + ax)^n = C(n, 0) + C(n, 1)(ax) + C(n, 2)(ax)^2 + C(n, 3)(ax)^3 + ...[/tex]

where C(n, k) is the binomial coefficient, which equals[tex]n!/(k!(n-k)!).[/tex]

The first few terms of this expansion are:

[tex](1 + ax)^n = 1 + nax + n(n-1)(a^2/2)x^2 + n(n-1)(n-2)(a^3/6)x^3 + ...[/tex]

Comparing with the given expression [1 - 20x + 150x^2 + cx^3], we have:

[tex]1 - 20x + 150x^2 + cx^3 = 1 + nax + n(n-1)(a^2/2)x^2 + n(n-1)(n-2)(a^3/6)x^3 + ...[/tex]

Equating coefficients of [tex]x^3[/tex] on both sides, we get:

[tex]c = n(n-1)(n-2)(a^3/6)[/tex]

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A. The characteristic equation for the associated homogeneous equation is:

r² - 4r + 4 = 0

B. The characteristic equation has a repeated root of 2, so the fundamental solutions for the associated homogeneous equation are:

[tex]y1(t) = e^(2t)[/tex]

[tex]y2(t) = te^(2t)[/tex]

The Wronskian of these solutions is:

[tex]W(y1, y2) = det([y1 y2; y1' y2']) = det([e^(2t) te^(2t); 2e^(2t) (2t+1)e^(2t)]) = 4e^(4t)[/tex]

So,[tex]W(y1, y2) = 4e^(4t)[/tex]

C. We need to compute the following integrals:

[tex]W(t)dt = ∫(2e^(2t))(te^(2t))dt = ∫(2t)e^(4t)dt = (1/4)te^(4t) - (1/8)e^(4t) + C1[/tex]

[tex]W(dt) = ∫(4e^(4t))dt = (1/4)e^(4t) + C2[/tex]

D. The general solution is:

[tex]y(t) = c1 y1(t) + c2 y2(t) + yp(t)[/tex]

To find a particular solution, we assume yp(t) takes the form:

[tex]yp(t) = A e^(2t)[/tex]

where A is a constant to be determined. We substitute this into the nonhomogeneous equation and solve for A:

[tex]y'' - 4y' + 4y = -6e^(2t)[/tex]

[tex](4A - 4A) e^(2t) = -6e^(2t)[/tex]

[tex]0 = -6e^(2t)[/tex]

This equation has no solution, so we need to modify our assumption for yp(t) by multiplying by t:

[tex]yp(t) = A t e^(2t)[/tex]

We substitute this into the nonhomogeneous equation and solve for A:

[tex]y'' - 4y' + 4y = -6e^(2t)[/tex]

[tex](8A - 8A + 4A) te^(2t) = -6e^(2t)[/tex]

[tex]4A = -6[/tex]

[tex]A = \frac{-3}{2}[/tex]

So, a particular solution is:

[tex]yp(t) = (-3/2) t e^(2t)[/tex]

Therefore, the general solution to the nonhomogeneous equation is:

[tex]y(t) = c1 e^(2t) + c2 t e^(2t) - (3/2) t e^(2t)[/tex]

or

[tex]y(t) = (c1 - (3/2) t) e^(2t) + c2 t e^(2t)[/tex]

where c1 and c2 are constants determined by initial conditions.

A non-homogeneous equation is a type of mathematical equation that involves both homogeneous and nonhomogeneous terms. In general, a homogeneous equation is one in which all the terms have the same degree, whereas a nonhomogeneous equation contains terms of different degrees.

In the context of linear algebra, a nonhomogeneous equation is typical of the form Ax = b, where A is a matrix, x is a vector, and b is a non-zero vector. The term "nonhomogeneous" refers to the fact that b is not the zero vector. In differential equations, a nonhomogeneous equation is one that includes a forcing function or input that is not equal to zero. The solution to such an equation can be found by adding the particular solution to the general solution of the corresponding homogeneous equation.

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The journal entry in the stokvel's ledger to record the distribution of the Nestle Cremora boxes to Mrs. Bosoga would be as follows:

Date Account Debit Credit

Dec 2022 Nestle Cremora ZAR 3,750

Dec 2022 Mrs. Bosoga  ZAR 3,750

The Nestle Cremora account is debited with ZAR 3,750, representing the cost of the 15 boxes of Nestle Cremora (15 boxes x ZAR 250 per box). The Mrs. Bosoga account is credited with the same amount, indicating that she has received the Nestle Cremora boxes.

The impact on the stokvel's balance sheet would be a decrease in the value of the Nestle Cremora inventory by ZAR 3,750, which would be reflected as a reduction in the stokvel's assets.

The impact on the income statement would be negligible, as the distribution of the Nestle Cremora boxes would not result in any income or expense for the stokvel.

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Mrs. Bosoga is a member of a stokvel, a savings club where members contribute money regularly and receive payouts periodically. During December 2022, Mrs. Bosoga received a share of 15 boxes of Nestle Cremora from the stokvel. The market value of each box of Nestle Cremora at the time was ZAR 250. The stokvel keeps track of its transactions using a ledger. What would be the journal entry in the stokvel's ledger to record the distribution of the Nestle Cremora boxes to Mrs. Bosoga? Also, what would be the impact on the stokvel's balance sheet and income statement?

The measure of the angle DAB for the right angled triangle ABD is found as   45°.

A right-angled triangle has two acute angles that add up to 90°. The smallest angle is the one that is opposite the smallest side, and the greatest angle is the one that is against the largest side.

In a triangle, the two angles that face the two equivalent sides are also equal. There can only be one right angle and one obtuse angle in a triangle.

For the question-

Triangle ABC is right angled at B.

D point makes:  AC = CD

And , AB = BC

Since ∠ABD = 90, given C is mid point.

Then, It is altitude on AD and it bisects the angle ABD into 2 equal halves as: ∠ABC = ∠CBD = 45.

Now, For triangle ABC

∠ABC = 45

∠BCA = 90

Then,

∠BAC + ∠ABC + ∠BCA = 180

∠BAC + 45 + 90 = 180

∠BAC = 180 - 135

∠BAC = 45°

Thus, the measure of the angle DAB for the right angled triangle ABD is found as  45°.

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Answer: x=211/1296

Step-by-step explanation:

Therefore, in about 15 years and 2 months, the senior class will have about 100 students.

An equation is a statement that expresses the equality of two mathematical expressions using mathematical symbols such as variables, numbers, and mathematical operations. The equality is represented by an equal sign "=" between the two expressions. Equations are used to represent mathematical relationships and solve problems in various fields such as physics, chemistry, engineering, and economics.

Given by the question.

Let P be the initial population of the senior class in the high school, and r be the rate of decrease in population per year (in decimal form).

Then, we can write the following equation to represent the situation:

P[tex](1-r)^{n}[/tex] = 100

We know that the current population of the senior class is 320, so we can substitute these values into the equation:

320[tex](1-0.07)^{n}[/tex] = 100

Simplifying the equation, we get:

[tex]0.93^{n}[/tex] = 0.3125

Taking the natural logarithm of both sides, we get:

n ln (0.93) = ln (0.3125)

Dividing both sides by ln (0.93), we get:

n = ln (0.3125) / ln (0.93)

Using a calculator, we find that n is approximately equal to 15.21 years.

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Answer:

Step-by-step explanation: In the problem, they tell us that

dL / dt = 7 cm/s (the rate at which the length is changing) and

dw / dt = 8 cm/s (the rate at which the width is changing)

Want dA/dt (the rate at which the area is changing) when L = 7 cm and w = 5 cm

The equation for the area of a rectangle is:

A = L·w, so will need the product rule when taking the derivative.

dA/dt = L (dw/dt) + w (dL/dt)

Now just plug in all of the given numbers:

dA/dt = (7)(7) + (5)(8) = 49+40 = 89  cm²/s

Answer:

To find the point that partitions the line segment AB in a ratio of 1:3, we can use the following formula:

P = (3B + 1A) / 4

where P is the point that partitions the line segment in a ratio of 1:3, A and B are the endpoints of the line segment, and the coefficients 3 and 1 represent the ratio of the segment we are dividing.

Substituting the values, we get:

P = (3*(-1, -5) + 1*(-5, 3)) / 4

P = (-3, -7)

Therefore, the point that partitions the line segment AB in a ratio of 1:3 is (-3, -7).

Step-by-step explanation:

Here, QRS represents the proportion of longest triangle to middle-length sides. 26/36 = 13/18 QUT: 12/16 = ¾ ≠ 13/18

Students should be taught that whereas a triangle can have many various side lengths and angles, a square must have all of its sides be the same length and all of its angles must be right angles.

Hence, a square cover must contain a minimum of 4 corner-power points. Nevertheless, each triangles may include one corners in its inside or twin vertex on edges (score of 1) for a not more than one point. Three triangles only cover a square with a maximum of three corner-power points.

[tex]QRS: 26/36 = 13/18[/tex]

[tex]QUT: 12/16 = 3/4 not equal 13/18[/tex]

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5) By AAA congruency rule, ΔVWU ≅ ΔMNU.

6) By SAS congruency rule, ΔCAB ≅ ΔUAV

If any twο sides and the angle included between the sides οf οne triangle are equivalent tο the cοrrespοnding twο sides and the angle between the sides οf the secοnd triangle, then the twο triangles are said tο be cοngruent by SAS rule.

5) ∠V ≅ ∠V = 36°

∠VUW ≅ ∠NUM

then according to angle sum property

∠VWU ≅ ∠MNU

Then,

ΔVWU ≅ ΔMNU

By AAA congruency rule, ΔVWU ≅ ΔMNU.

6) 77 ≅ 66 (common side)

42 ≅ 36 (common side)

∠CAB ≅ ∠UAV (common angle)

Then,

ΔCAB ≅ ΔUAV

By SAS congruency rule, ΔCAB ≅ ΔUAV

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Answer:

Step-by-step explanation:

To graph the line with slope 3 passing through the point (1,-5), we can use the point-slope form of the equation of a line, which is:

y - y1 = m(x - x1)

where m is the slope, and (x1, y1) is a point on the line.

Substituting the given values, we get:

y - (-5) = 3(x - 1)

Simplifying the equation, we get:

y + 5 = 3x - 3

Subtracting 5 from both sides, we get:

y = 3x - 8

Now we have the equation of the line in slope-intercept form, which is y = mx + b, where m is the slope and b is the y-intercept. Comparing this equation to the one we just found, we can see that the slope is 3 and the y-intercept is -8.

To graph the line, we can plot the y-intercept at (0,-8) and then use the slope to find other points on the line. Since the slope is 3, we can go up 3 units and to the right 1 unit to find another point on the line. We can repeat this process to find more points on the line, and then connect them to graph the line.

Answer:

x=0 & x=2

Step-by-step explanation:

To find when f(x)=g(x), then look for a value that is the same for both functions in the table. 0 occurs twice for the same x value. 0 also appear twice for the x value 2. This is when they are equal. The solution is x=0 and x=2

A basis for the space of 2x2 lower triangular matrices is [tex]\left(\left[\begin{array}{ccc}1&0\\0&0\end{array}\right],\left[\begin{array}{ccc}0&0\\1&0\end{array}\right],\left[\begin{array}{ccc}0&0\\0&1\end{array}\right]\right)[/tex].

Lower triangular matrices resemble the following:

[tex]\left[\begin{array}{ccc}a&0\\b&c\end{array}\right][/tex]

We can write it like this:

[tex]a\left[\begin{array}{ccc}1&0\\0&0\end{array}\right]+b\left[\begin{array}{ccc}0&0\\1&0\end{array}\right]+c\left[\begin{array}{ccc}0&0\\0&1\end{array}\right][/tex]

This demonstrates the set's

[tex]\left(\left[\begin{array}{ccc}1&0\\0&0\end{array}\right],\left[\begin{array}{ccc}0&0\\1&0\end{array}\right],\left[\begin{array}{ccc}0&0\\0&1\end{array}\right]\right)[/tex]

covers the set of lower triangular matrices with dimensions 2x2. Moreover, these are linearly independent, so attempting to

[tex]a\left[\begin{array}{ccc}1&0\\0&0\end{array}\right]+b\left[\begin{array}{ccc}0&0\\1&0\end{array}\right]+c\left[\begin{array}{ccc}0&0\\0&1\end{array}\right]=\left[\begin{array}{ccc}0&0\\0&0\end{array}\right][/tex]

leads to

[tex]\left[\begin{array}{ccc}a&0\\b&c\end{array}\right] =\left[\begin{array}{ccc}0&0\\0&0\end{array}\right][/tex]

which results in a = b = c = 0 right away. As there is no other way to

[tex]a\left[\begin{array}{ccc}1&0\\0&0\end{array}\right]+b\left[\begin{array}{ccc}0&0\\1&0\end{array}\right]+c\left[\begin{array}{ccc}0&0\\0&1\end{array}\right]=\left[\begin{array}{ccc}0&0\\0&0\end{array}\right][/tex]

, these matrices are linearly independent if a = b = c = 0.

Since

[tex]\left(\left[\begin{array}{ccc}1&0\\0&0\end{array}\right],\left[\begin{array}{ccc}0&0\\1&0\end{array}\right],\left[\begin{array}{ccc}0&0\\0&1\end{array}\right]\right)[/tex]

they serve as a foundation by spanning the collection of 2x2 lower triangular matrices and being linearly independent.

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1. The most difficult decision I had to make during the process was whether or not to pursue a higher degree. It was difficult because I had to weigh the financial and time commitment.

2. If I could improve something about my business, it would improve the customer service and communication.

3. What I learned in this experience I can also apply in many other areas of my life such as problem solving, communication, and time management.

1. Throughout the process, choosing whether or not to go for a graduate degree was the hardest choice I had to make. It was challenging since I had to compare the costs and time required to finish the degree against any potential advantages it might have for my job. Ultimately, I decided to pursue a higher degree since I felt that the benefits of doing so would outweigh the costs.

2. I would invest in better tools for customer support, implement a customer feedback system, and create more opportunities for customers to share their feedback and ideas. I would also invest in better training for customer service staff to ensure they are equipped with the necessary skills to handle customer inquiries and complaints effectively.

3. These skills can be used in my work life, personal relationships, and even my studies. By learning how to better manage my time and communicate effectively, I can become more productive and efficient in any task I take on. Additionally, problem solving is a skill that is applicable to many aspects of life, such as finding creative solutions to difficult issues or troubleshooting technical problems.

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The complete question is:

1. The most difficult decision I had to make during the process was …………… It was difficult because ……………. .

2. If I could improve something about my business, it would improve …… .

3. What I learned in this experience I can also apply in …………….

Answer:

17

Step-by-step explanation:

5+T(6-3); T=4

Use order of operations. Parenthesis, multiplying, then add last.

= 5 + 4(6 -3)

= 5 + 4(3)

= 5 + 12

= 17

Answer:

To find the average distance away from the mean, we need to first find the mean distance from the mean. To do this, we need to find the mean of the distances from the mean:

|32 - 33| = 1

|45 - 33| = 12

|23 - 33| = 10

|35 - 33| = 2

|30 - 33| = 3

Mean distance from the mean = (1 + 12 + 10 + 2 + 3) / 5 = 6. However, the question asks for the average distance away from the mean, so we need to take the absolute value of this result:

Average distance away from the mean = |6| = 6

To find the mean absolute deviation, we first need to find the deviations from the mean:

12.7 - 15.2 = -2.5

22 - 15.2 = 6.8

23.5 - 15.2 = 8.3

24 - 15.2 = 8.8

11 - 15.2 = -4.2

22 - 15.2 = 6.8

Next, we need to take the absolute value of each deviation:

|-2.5| = 2.5

|6.8| = 6.8

|8.3| = 8.3

|8.8| = 8.8

|-4.2| = 4.2

|6.8| = 6.8

The sum of these absolute deviations is:

2.5 + 6.8 + 8.3 + 8.8 + 4.2 + 6.8 = 37.4

To find the mean absolute deviation, we divide this sum by the number of data points:

Mean absolute deviation = 37.4 / 6 = 6.23

Therefore, the answer is not listed among the choices given.

Answer:

B. 33

Step-by-step explanation:

1) Find the mean

32+45+23+35+30/5

165/5

=33

The volume of the frustum is 970 cm².

What is frustum?

In geometry, a frustum is a three-dimensional solid that is created by cutting a larger solid, such as a cone or pyramid, with a plane parallel to its base, and then removing the smaller solid that lies above the plane. The resulting solid has two parallel bases of different sizes, and its sides are trapezoidal in shape.

We know that, volume of frustum is given by

                       V = (1/3) * h * (A + B + sqrt(A * B))

where V is the volume of the frustum, h is the height of the frustum, A is the area of the rectangular base, and B is the area of the rectangular top.

So, A = base × height = 8 × 16

                                    = 128 cm²

Similarly, B = base × height =  3 × 6

                                             = 18 cm²

and, given height of frustum = 15 cm

Now, putting all values into the formula:

So,  V = (1/3)× h × (A + B + sqrt(A×B))

          = 1/3 × 15 × ( 128+18 + √(128×18))

          = 5 × ( 146 + 48 )

          = 970 cm²

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Answer: 0.04

Step-by-step explanation:

In order to get 4% as a decimal, you must divide 4 by 100.

4/100 = 0.04

Thus, the answer to your question is 0.04

The expressions that are equivalent to (x-2)² is x² - 4x + 4. (option B)

Now, let's look at the expression (x-2)². This is a binomial expression that can be simplified by applying the rules of exponents. Specifically, we can expand this expression as follows:

(x-2)² = (x-2) * (x-2)

= x * x - 2 * x - 2 * x + 2 * 2

= x² - 4x + 4

So, the expression (x-2)² is equivalent to x² - 4x + 4.

However, the problem asks us to identify other expressions that are equivalent to (x-2)². To do this, we can use the process of factoring. We know that (x-2)² can be factored as (x-2) * (x-2). Using this factorization, we can rewrite (x-2)² as:

(x-2)² = (x-2) * (x-2)

= (x-2)²

So, (x-2)² is equivalent to itself.

Hence the correct option is (B).

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Complete Question:

Which expressions are equivalent to (x−2)²?

Select the correct choice.

A. (x + 2) (x - 2)

B. x² - 4x + 4

C. x² - 2x + 5

D. x² + x - 2x

Answer:

AD=4

Step-by-step explanation:

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The length of AD in the triangular prism is 9.8 cm.

The length of AD in the triangular prism can be found using Pythagoras' theorem, which states that in a right triangle, the square of the length of the hypotenuse (the side opposite the right angle) is equal to the sum of the squares of the other two sides.

The base of the prism is a right triangle, so:

AD² = AE² + ED²

AD² = 4² + 9²

AD² = √97

AD = √97

AD = 9.8 cm (rounded to 1 decimal)

Therefore, the length of AD in the triangular prism is 9.8 cm.

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Complete Question:

Use Pythagoras' theorem to work out the length of AD in this triangular prism. Give your answer in centimeters (cm) to 1 decimal point.

Given that the graph is falling downward, it can be seen that the graph is negative.

Before the tank's water level starts to drop, there are 120 gallons there.

Finding the slope of the graph will give us the amount of water that was lost every minute.

Slope is equal to a climb or a run.

increase = water in gallons

run equals time in minutes.

Slope equals y2 - y1 / x2 - x1

Two points will be chosen from the graph.

( 30, 80) and (60, 40) (60, 40)

Let x1=30, y1=80, x2=60, and y2=40.

Slope = 40 - 80 / 60 - 30

Slope = -40 / 30

Slope = -4/3

The result in the negative represents a loss in gallons of water per minute.

According to the line of best fit, a gallon of water was lost every minute or so.

The graph indicates that the tank will be empty in around 60 minutes.

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The value of the angle m<CED is 100 degrees

Corresponding angles are simply described as those angles that are formed by same corners or corresponding corners with a transversal when two parallel lines are joined by any other line.

Also, corresponding angles are created when two parallel lines are intersected by a transversal.

The different types of corresponding angles are;

Note that corresponding angles are equal.

From the information given, we have that;

m < BHG = m<CED

If m< BHG = 100 degrees

Then, m< CED = 100 degrees

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(a) Starting with the 75% estimate for Italians, the sample you must collect in order to estimate the proportion of PTC tasters within ± 0.1 with 90 % confidence is n = 51.

(b) The sample size required if you made no assumptions about the value of the proportion who could taste PTC is n = 68.

(a) To estimate the sample size needed to find the proportion of PTC tasters within ± 0.1 with 90% confidence, we will use the formula for sample size estimation in proportion problems:
n = (Z² * p * (1-p)) / E²

Where n is the sample size, Z is the Z-score corresponding to the desired confidence level (1.645 for 90% confidence), p is the proportion of PTC tasters (0.75), and E is the margin of error (0.1).

n = (1.645² * 0.75 * (1-0.75)) / 0.1²
n = (2.706 * 0.75 * 0.25) / 0.01
n ≈ 50.74

Since we need a whole number, we round up to the nearest whole number:
n = 51

(b) If no assumptions were made about the proportion of PTC tasters, we would use the worst-case scenario, which is p = 0.5 (maximum variance):

n = (1.645² * 0.5 * (1-0.5)) / 0.1²
n = (2.706 * 0.5 * 0.5) / 0.01
n ≈ 67.65

Again, rounding up to the nearest whole number:
n = 68

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According to the information, Gabriel should buy only the products he needs to spend less money.

To calculate the option in which Gabriel would pay less, we must take into account the options that he has, first of all he has the option of buying only what he needs (pants and shirt). Second, he has the option to buy all the products to get a bigger discount.

If he buys only the pants and the shirt, he will have a 20% discount:

If you buy all four products you will have a 40% discount:

Based on the information, we can infer that if Gabriel buys all four products, he will get a greater discount of $24,400. However, if you do not want to spend so much money, it is better to only buy the two products you need because you will spend less money.

Note: This question is incomplete. Here is the complete information:

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Here is the question in English:

18. In a store they have the following promotion for 1 day:

Gabriel needs to buy pants and a shirt, but when checking these in the store he also looked at socks and sneakers. He chose the following products:

He thinks that if he buys more products besides the shirt and pants, he could pay less than if he only takes the shirt and pants he needs.

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The number of litres (Volume) of oil that is present in the tank of given dimension is calculated to be 806 litres (approximately).

The volume of any cylinder can be calculated using the formula,

V = πr²h

(Here V is the volume, r is the radius of the base, and h is the height of the cylinder)

As, the cylinder is one-fifth full of oil, which means that it is four-fifths empty. Therefore, the volume of oil in the tank is:

Volume of oil = (1/5) x Total Volume

Substituting the given values, we have:

Total Volume =  π(80cm)²(200cm) = 4,031,240 cm³

Volume of oil = (1/5) x 4,031,240 cm³ = 806,248 cm³

Converting cm³ to litres, we have:

1 litre = 1000 cm³

Volume of oil = 806,248 cm³ ÷ 1000 = 806.248 litres

Therefore, after rounding of the final volume (806.248 litres) to the nearest litre, the final answer is found to be 806 litres of oil.

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