Which of the following expressions is equal to 5-2m?
a. 7-2(m+1)
b. 7-(2m-5)
c. 7-2(m-2)

the answer is option A

consider expanding into the brackets, helpful?

part a

x     y

0     8

1     7.5

2     7

3     6.5

4     6

5     5.5  

for every hour i deducted .5 inches from the length of the candle

part b

it is a function because for every x value there is only one y value

part   c

for every x value there is only one y value

x       y

0       8

1       7.6

2       7.2

3       6.8

step-by-step explanation: