(-9)^-2 * (-9)^0 ÷ (-9)^1

Answer:Use the radioactive decay formula: A = Ao*2^(-t/h), where:

A = Amt of remaining after t time

Step-by-step explanation:

Ao = Initial amt

t = time of decay

h = half-life of the substance

in this problem

A = 21.5

Ao = 38

t = 1 year

h = half life of substance

Answer:

10(x + 4)

Step-by-step explanation:

Let x be the number

I hope this helps!

The mathematical expression​ of Ten times the sum of a number and 4 is 10(x + 4).

Expression in maths is defined as the collection of numbers variables and functions by using signs like addition, subtraction, multiplication, and division.

The Numbers constants, variables, operations, functions, brackets, punctuation, and grouping can all be represented by mathematical symbol; that can also be used to indicate the logical syntax's order of operations and other features.

Let x be the number,

Where the Sum of a number and 4:

x + 4

Then Ten times the sum of a number and 4:

10(x + 4)

Therefore, the mathematical expression​ of Ten times the sum of a number and 4 is 10(x + 4).

To know more about an expression follow;

brainly.com/question/19876186

#SPJ2

Answer:

Explained below.

Step-by-step explanation:

Categorical variables are those variables that represents certain characteristic or attribute. Such as gender, eye color, age limit and so on.

Numerical variables are variables that assumes numerical values. Such as height, weight, time and so on.

Numerical variables are of two types: Discrete and Continuous.

Discrete variables are those variables that assumes finite whole number values. Such as number of girls in a house, number of children in the nursery and so on.

Continuous variables are those variables that assumes values from a fixed interval. Such as length of screw, amount of payment for donations and so on.

The attributes are classified as follows:

a. Brand of computer purchased by a customer : Categorical

b. State of birth for someone born in the United States : Categorical

c. Price of a textbook : Numerical and Discrete

d. Concentration of a contaminant (micrograms per cubic centimeter) in a water sample : Numerical and Continuous

e. Zip code : Numerical and Discrete

f. Actual weight of coffee in a 1-pound can: Numerical and Continuous

Answer:

7x+12x=82$

Step-by-step explanation:

Dalyn is selling girl scout cookies. She sold 7 boxes of thin mints (x) and 12 boxes

of tagalongs (y). If she made $82 selling cookies, write an equation that

represents the scenario. *

Answer:

B if your doing prep

Step-by-step explanation:

math

9514 1404 393

Answer:

  A. f(x)=56,000(0.93)x+8400

Step-by-step explanation:

The growth rate is -7%, so the growth factor will be 1 -7% = 0.93. This is the base of the exponential term.

The 8400 special passes will add 8400 visitors to the park in addition to those who pay the regular fee. Thus the number of visitors is ...

  f(x) = 56,000(0.93^x) +8400 . . . . matches choice A

Both are 123

When dealing with angles you have to remember that all angles add up to 180, “the line angle” as I like to call it, it’s because 180 is completely flat.

2: Here you can use your eyes to see the angle is wider than 90, ”a perfect right”. So you can easily assume that the angle is gonna be 123.

1: the angle here shares the same place as your original angle. So you can easily assume that they have the same degree

Simple things very clear, hope this helps

Answer:

Step-by-step explanation:

[tex]\sqrt{x} \sqrt{x} -(-9)^{2} \\=x-81\\x=81[/tex]

Answer:

9 is the answdr i think sorry if wronf

Answer: (F-G)(x)=5x2+2i +1

Step-by-step explanation

The resulting function for (f−g)(x) is 2x²+x-3

Let the required functions be:

f(x)=2x²+3x

g(x)=2x+3

We are required to find (f−g)(x).

(f−g)(x). = f(x) - g(x)

(f−g)(x) = 2x²+3x - (2x+3)

(f−g)(x) = 2x²+3x - 2x - 3

(f−g)(x) = 2x²+x-3

Hence the resulting function for (f−g)(x) is 2x²+x-3

Learn more here:  https://brainly.com/question/17412243

Answer:

[tex]Vc = 2,261.9\ in^3[/tex]

Step-by-step explanation:

Volume of a Cylinder

The volume of a cylinder of radius r in and a height h can be calculated by:

[tex]Vc=\pi\cdot r^2\cdot h[/tex]

The height of the cylinder is h = 20 in and the base radius is r = 6 in, thus:

[tex]Vc=\pi\cdot 6^2\cdot 20[/tex]

[tex]Vc = 2,261.9\ in^3[/tex]

Answer:

[tex]y=-\frac{1}{3}x+1[/tex]

Step-by-step explanation:

Let the equation of the line is,

y = mx + b

Where 'm' = slope of the line

b = y-intercept

From the picture attached,

b = 1

Slope of the line passing through two points [tex](x_1,y_1)[/tex] and [tex](x_2,y_2)[/tex] is represented by,

m = [tex]\frac{y_2-y_1}{x_2-x_1}[/tex]

Slope of the line passing through the points (0, 1) and (3, 0) will be,

m = [tex]\frac{0-1}{3-0}[/tex] = [tex]-\frac{1}{3}[/tex]

Equation of the line will be,

[tex]y=-\frac{1}{3}x+1[/tex]

Answer:

Find the Inverse Function f(x)=5x-7. Replace with . Interchange the variables. Solve for . Tap for more steps... Rewrite the equation as . Add to both sides of the equation. Divide each term by and simplify.

Step-by-step explanation:

Step-by-step explanation:

5x+7=8x-3

subtract 7 from both sides

5x=8x-10

subtract 8x from both sides

-3x=-10

divides -3 from both sides

x=0.3

I hope I'm right and hope I helped :))

Answer: May you give the statements?

Step-by-step explanation:

Answer:

Step-by-step explanation:

Where is the statement?

Answer:

a) 0.572

b) There is moderate positive relationship between  age and happiness.

c)

Scatter plot is attached

Step-by-step explanation:

a)

[tex]Sample correlation coefficient=r=\frac{nsumxy-(sumx)(sumy)}{[nsumx^{2}-(sumx)^2][ nsumy^{2}-(sumy)^2] }[/tex]

Age(x)  Happiness(y)          x²         y²        xy

49     62            2401 3844 3038

51     66            2601 4356 3366

41      67             1681        4489 2747

65    71              4225 5041 4615

84     87             7056 7569 7308

41      60            1681  3600 2460

83     86            6889 7396 7138

18     78             324  6084 1404

36     59            1296 3481 2124

61     63             3721 3969 3843

15     77             225  5929 1155

86    90            7396 8100 7740

73     70             5329 4900 5110

32     62                 1024 3844 1984

84     93              7056 8649 7812

23     72             529  5184 1656

52    58            2704 3364 3016

72     73             5184 5329 5256

63     63             3969 3969 3969

30    66            900  4356 1980

72     78             5184 6084 5616

47     60            2209 3600 2820

88     95               7744 9025 8360

69    72                   4761 5184 4968

sumx=1335

sumy=1728

sumx²=86089

sumy²=127346

sumxy=99485

n=24

[tex]Sample correlation coefficient=r=\frac{24(99485)-(1335)(178)}{[24(86089)-(1335)^2][ 24(127346)-(1728)^2] }[/tex]

Sample correlation coefficient=0.572

b)

Sample correlation coefficient=0.572 shows the moderate positive correlation between age and happiness. As the age increases happiness also moderately increases.

c)

The attached scatter plot shows that the as age increases happiness also moderately increases.

Answer:

The solution to this problem is −2−14

Step-by-step explanation:

Answer:

$7.99 for 10 cans

Step-by-step explanation:

First you want to see what the price is for one can. Do this by dividing 6 from 4.99 (4.99/6). This gives you 83 cents per can. Do the same for the other, and you get 79 cents per can. 79 cents is a better value than 83 cents.

Step-by-step explanation:

Remember (y2-y1)/(x2-x1)

[tex] \frac{y {}^{2} - y ^{1} }{x {}^{2} - x {}^{1} } [/tex]

for y, 10-6 = 4

for z, -3 + 1= -2

4/-2 is -2

your slope is -2

Answer:

trump 2020

Step-by-step explanation:

reeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeee

Answer:

You multiply

Step-by-step explanation:

You multiply 3 4/5 and 2 5/7

Answer is 10 1/3

Answer:

Step-by-step explanation: B

Answer:

A) [tex]5x-1=-6[/tex]

B) [tex]x=-1[/tex]

Step-by-step explanation:

On the left, we have five (positive) Xs and one -1. So, we can represent the left with the expression [tex]5x-1[/tex].

On the right, we have six -1s. So, we can represent the right with the expression [tex]-6[/tex].

A)

Since the balance is balanced, we know that the two expressions are equal to each other. So, we can write the equation:

[tex]5x-1=-6[/tex]

B)

Now, we can solve the equation for x. Add 1 to both sides:

[tex](5x-1)+1=(-6)+1[/tex]

The left will cancel. Add on the right:

[tex]5x=-5[/tex]

Finally, divide both sides by 5:

[tex](5x)/5=(-5)/5[/tex]

The left side will cancel. So, the value of x is:

[tex]x=-1[/tex]

Answer:

A)  5x-1=-6

B) x=-1

Step-by-step explanation:

Answer:

d

Step-by-step explanation:

when you look at a parallelogram, it could be a rectangle, square, or rhombus. so apply each of these statements to all of these shapes to see if they are true.

a. on a rectangle, not all sides are congruent. cant be that one

b. on a rhombus, not all angles are congruent. cant be that one

c. on a rhombus, the diagonals are not the same length. cant be that one

d. on every parallelogram, the opposite angles are congruent because that is what makes opposite sides parallel

hope this helped :)

Answer:

14) No. 15) No. 16) Yes. 17) Yes.

Explanation:

When something is not a function, you can either use the vertical line test which involves drawing a line going up and down to see if the graph hits the line more than once. If this is the case, it is not a function. Or the input or x value of a function cannot have more than one

output or y value.

The line x = |y| on the graph of #14 is not a function because there is more than one y value for a single x value. This also hits a vertical line more than once.

The table on #15 is not a function because their is more than one y value per x value. It also hits a vertical line more than once.

The equation y = 1/4x is a function because there is only one output for each input. This also does not hit a vertical line more than once

The equation x = y - 1 is a function because it is simply a rearanged version of y = x + 1 which has only one output for each input. It also does not hit a vertical line more than once.

The length of each side of the square will be 1 yard.

A square has four equal sides, and four vertices, and is a closed, two-dimensional object. It has parallel sides on either side. A square is also equivalent to a rectangle with equal length and width.

The square's perimeter is four times as long as its side.

For a square with a side length of a unit, we get:

Perimeter of the square = 4a unit

A square has a perimeter of 4 yards. Then the length of each side of the square will be given as,

4 = 4a

a = 1 yard

The length of each side of the square will be 1 yard.

More about the perimeter of the square link is given below.

https://brainly.com/question/11495285

#SPJ2

Answer:

I believe they are vertical angles

Step-by-step explanation:

Vertical angles are angles that are across from each other. They are also equal to each other.

Answer:

Alright well first off you start by converting everything to fractions, but decimals work better for me. So it would be 40.5 and 1.25, 40.5 being miles and the other gas. Divide 40.5 by 1.25, giving you 32.4

His car get 32.4 miles per gallon