in a group of 30 children, 80%can’t swim how many children can’t swim

Answer:

26.5 units

Step-by-step explanation:

The height of the ball at any time t is given by :

[tex]h(t)= -16t^2 + 40t + 1.5[/tex] ...(1)

We need to find the maximum height of the ball.

For maximum height, put [tex]\dfrac{dh}{dt}=0[/tex]

i.e.

[tex]\dfrac{d( -16t^2 + 40t + 1.5)}{dt}=0\\\\-32t+40=0\\\\t=\dfrac{40}{32}\\\\t=1.25\ s[/tex]

Put t = 1.25 in equation (1) to find the maximum height.

So,

[tex]h(t)= -16(1.25)^2 + 40(1.25) + 1.5\\\\=26.5\ units[/tex]

So, the maximum height reached by the ball is 26.5 units.

Answer:

Assuming that you're being asked to simplify the expression. If you are, then the answer is 2n - 8

Step-by-step explanation:

Step-by-step explanation:

22/7*9*9=254.5714286

Answer:

diagramming, knowing your properties well, understand and know the angles, and have a good math understanding

Step-by-step explanation:

hope this helps

131m

Step-by-step explanation:

274.5÷4.5=61

4.5m×2=9m

61m×2=122

122m+9m=131m

Answer:

Perimeter = 131 m

Step-by-step explanation:

Area=Length x Width so:

274.5 = 4.5 x Width

Width = 274.5/4.5 = 61 m

Perimeter = 2 Widths + 2 Lengths so:

Perimeter = 2(4.5)+2(61 )= 131 m

Answer:

C

Step-by-step explanation:

The 3 triangles are all similar.

Using the 2 inside then the ratios of corresponding sides are equal, that is

[tex]\frac{x}{3}[/tex] = [tex]\frac{12}{x}[/tex] ( cross- multiply )

x² = 36 ( take the square root of both sides )

x = [tex]\sqrt{36}[/tex] = 6 → C

Answer:

C) x = 6

because this is a right triangle

=> we have:

(12² + x²)(3² + x²) = (15x)²

<=> 1296 + 153x² + x⁴ = 225x²

<=> x⁴ - 72x² + 1296 = 0

<=> (x² - 36)² = 0

<=> x² = 36

=> x = 6

Answer:

220 £

Step-by-step explanation:

Answer:

There are 365 days in a year, which means there are 2555 days in 7 years.

If the caterpillar spends 90% of its life frozen, it will spend about 2300 days of its life frozen.

Let me know if this helps!

Answer:

6.3 years

Step-by-step explanation:

90 divided by 100 times 7

Answer:

1/2=2/4

Step-by-step explanation:

Answer:

For 1 it is D

For 2 it is A

Hope this helps :)

Step-by-step explanation:

Answer:

#1

Option D

#2

As

[tex]\\ \sf\longmapsto x\propto y[/tex]

It is equal to the x-intercept of the line.

Option A is correct

Answer:

154

Step-by-step explanation:

The expression is  [tex]f(x)=4x^2-7x+7[/tex] and we know that  [tex]f(x)=f(7)[/tex]. Therefore, you will have to substitute x with 7.

Calculations:

[tex]f(x)=4x^2-7x+7[/tex]

[tex]f(7)=4(7)^2-7(7)+7[/tex]

[tex]4(49)-49+7= 154[/tex]

Answer:

I think that you need to plug 7 in to the x's

Step-by-step explanation:

Yes it looks very weird, but if you don't think that is right, Use the 7 for the F's.

One of them should come out right. :3

Answer:

eat ice cream it will make the pain go away

Step-by-step explanation:

Answer:-4/5

Step-by-step explanation:

(3,3)

(-2,-1)

Y2-y1/x2-x1

3- (-1)/ -2 -3

4/-5

Answer:

4 over 5 (4/5)

Step-by-step explanation:

Its extremely simple. You need to start from the lower point, and count up until you get to the same lime as the other point. Starting from the lower point, you count up 4 to get on the same line. Then, since its on the right, you count to the right 5, till you get to the dot, and you get 4/5. All you have to do is just count

We want to find the graph of a system of inequalities. We want to select the correct option, but sadly is really hard to interpret the given text, so I will add a graph of the system at the end.

The system is:

To graph these we first need to graph the two lines:

y =-3x + 1

Is a line with a negative slope that passes through the y-axis at y = 1.

Because here we have y ≤ -3x + 1 we know that y must be equal or smaller than the line, thus we need to shade below the line, and because y can be equal to any value in the line we need to use a solid line.

For the other equation:

y = (1/2)*x+ 3

We have a positive slope and this line intercepts the y-axis at y = 3.

Similar as before, here we have y ≤ (1/2)*x+ 3 so the shaded area will be below the line and the line must be solid.

With this in mind, we can graph the system, and you can see it below:

If you want to learn more, you can read:

https://brainly.com/question/19526736

Answer:

b sonaire

Step-by-step explanation:

Hope that helps

Answer:

6x - 2(x - 3) and x + 3(x - 2) - 6

The two expresaions that are quivalent are 6x - 2(x - 3) and x + 3(x - 2) - 6.

Step-by-step explanation:

First expression which is 4(x - 3) is an example of a binomial that when multiplied together, the product would be 4x - 12. Therefore, second and third expressions are the answer.

#CarryOnLearning

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Answer:

i think your answer would be 35

Step-by-step explanation:

oh sorry it's answer is 42.

calculate by adding all the individuals less than 40

Answer:

I think B is the right one.

Step-by-step explanation:

Hope this helped

Answer:

608,900

Step-by-step explanation:

it is hard to explain, but here is the answer

The number 608,897 to the nearest tens is 608,900.

Rounding off is the method of simplifying a number to the next closest number by maintaining it's value.

Rounding can be done for decimals as well as whole numbers. Rounding can be done to different place values like tens, hundreds, and in decimals, tenths, hundredths, etc. can be done.

The given number is 608,897.

We have to round this to the nearest ten.

For that, we have to consider the digits in the place values ones and tens.

The digit in the ones is 7. Replace it with 0.

Since the digit in the ones is greater than 5, the digit in the tens column get increased by 1. So 9 in the tens column become 10. By keeping 0 at the tens column 1 is given to the next place value, hundreds. So the digit on the hundreds value which is 8 get increased by 1 and become 9.

Thus the number 608,897 is rounded to 608,900.

Hence the number 608,897 can be rounded off to the nearest tens as 608,900.

Learn more about Rounding Off here :

https://brainly.com/question/13391706

#SPJ2

Answer:

Explanation:

2 ½: 2.5

3 ⅕: 3.2

Base: 3.2

Height: 2.5

3.2 · 2.5 = 8

Answer: The answer is the second option.

Step-by-step explanation:

Answer:

$12.60 is a better deal

Step-by-step explanation:

hope this helps

Answer:

uiuiuiui86767

Step-by-step explanation:

your answer is e330408384

Answer:

simple

Step-by-step explanation:

The radius of the wheel can be solved from its given speed and RPM.

Converting km/h to m/min

speed = 66 km / h = 66000 m / 60 min

speed = 1100 m / min

Converting one revolution to meters

1100 m / min = 500 revolution / min ... (given)

500 revolutions = 1100 m

1 revolution = 2.2 m

Solving for the radius of the wheels in meters

1 revolution = 2.2 m

2 * pi * radius = 2.2 m

radius = 2.2 m / 2 * pi

radius = 1.1 m / pi

radius = 0.3501 m

Answer:

12) You should "Never drop trash on the ground"

13) I believe "Everyone should be aware about littering"

14) I believed "that everyone should know littering is bad "

15) Do you think "Littering is bad?"

16) I can't stand "when people do not care about littering " 

17) It is important "to be aware about littering and the effect it has on the world"

Step-by-step explanation:

Answer:

0.58333333333

Simplify is 0.6

Step-by-step explanation:

i think

Answer:

7/12

Step-by-step explanation:

the least common denominator is 12

4 goes into 12 three times so you multiply both numbers in 3/4 by three

3/4 = 9/12

6 goes into 12 twice so multiply both the 1 and 6 by two

1/6 = 2/12

so the equation becomes 9/12 - 2/12

subtract the numerators

9-2= 7

7/12 can't be simplified any farther so that's the final answer

Answer:

[tex]\frac{35}{54}[/tex]

Step-by-step explanation:

When multiplying two fractions, you multiply across always. We have two fractions :

7/9 and 5/6

So multiply across :

[tex]\frac{7 * 5}{9 * 6}[/tex]

[tex]\frac{35}{54}[/tex]

Answer:

= 8.88

Step-by-step explanation:

£1 = 1.11 x £8 = 8.88 (euro)

Step-by-step explanation:

3. Between √9 and √16 or 3 nd 4

5. D

6. 7cubic inches

7. 8/45

8. 0.5 m

9. 4/25

Answer:

The answer is 3.16

Answer:

8

Step-by-step explanation:

Use Pythagorean theorem a^2 + b^2= c^2.

6^2 + x^2 = 10^2 or 36 + x^2 = 100. Solve for x by subtracting 36 from both sides. X^2 = 64, then take the square root of both sides. X =8