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2 years ago

8

A middle school is selling candy bars to raise money for new calculators. The graph shows the number of candy bars sold, x, and

the amount of money collected, y.
Enter a value that completes the equation correctly.

Y=__x

2 answers:

Aliun [14]2 years ago

6 0

Y equals 2.5x because it increases 2.5

Naily [24]2 years ago

4 0

Y=2.5x as each time it increases by 2.5

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Please answer !!!!!!!!!

xxMikexx [17]

Answer:

answer is b

Step-by-step explanation:

look at the picture

3 0

3 years ago

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Select each pair of functions that are inverses of each other

svlad2 [7]

Answer:

The first two choices only: A and B.

Step-by-step explanation:

The inverses are the ones with one relation having point (x,y) and the other relation having point (y,x). This most obvious when looking at points on a table or a list of points.

So the first pair are inverses because per point (x,y) on the first list you have (y,x) on the second list.

Examples:

1st list contains (-5,-9) while second list contains (-9,-5).

1st list contains (3,7) while the second list contains (7,3).

As long as (a,b) is in the first list and (b,a) is in the second or vice versa, then the pair of relations are inverses. So the first choice contains inverses.

Now lets talk about the pair of functions given in function notation.

Let's start with the first.

y=x+7

Extend the first idea more. Just swap x and y and then see after solving for y if what it equals is what g equals then f and g are inverses in the second choice.

x=y+7

Subtract 7 on both sides:

x-7=y

y=x-7

This is what g equals so the second choice is an answer.

The last choice does not contain a pair of inverses. Example: (2,3) is in the first list but (3,2) is not in the second.

6 0

3 years ago

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Please help. I’ll mark you as brainliest if correct!

chubhunter [2.5K]

Answer:

$\boxed{\sf \ \ \ f^{-1}(x)=1+\sqrt{x} \ \ \ }$

Step-by-step explanation:

the minimum of f is for x = 1 and f(1)=0

f is decreasing for x<=1 and increasing for x>=1

so the domain is $[1;+\infty[$

$f^{-1}(f(x))=x =f^{-1}((x-1)^2)\\\\f(f^{-1}(x))=x=(f^{-1}(x)-1)^2$

x>=1 so x is positive and we can take the square root

so $f^{-1}(x)=1+\sqrt{x}$

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2 years ago

Match each equation with its number of unique solutions.

Anni [7]

Answer:

y = 3x^2-6x+3 one real solution

y = -x^2 - 4x + 7 two real solution

y = -2x^2+9x-11 two complex solutions

Step-by-step explanation:

b^2-4ac = 0 1 repeated real solution

b^2-4ac > 0 2 distinct real solutions

b^2-4ac < 0 2 complex solutions

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3 years ago

Simplify by combining like terms 2x + 5 + x

Scilla [17]

Answer:

3x+5

Step-by-step explanation:

combine like terms add the variables together, then its simplified

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2 years ago

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