You went roller skating with some friends. You decided to buy a pizza and each of your friends a soda. The pizza costs $15 and each soda costs $2.75. You spend a total of $28.75 on a pizza and soda before tax. How many sodas did you buy in addition to the pizza? Write the equation and solve it. Must show work to receive credit.

ummm seems that u didnt post the attachement !

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answer: c

substitute in the values.

for a:

f(0) = 0 + 9

f(0) = 9

a is a solution.

for b:

f(7) = 14 + 9

f(7) = 23

b is a solution.

for c:

f (3) = 6 + 9

f(3) = 15

c is not a solution. it's supposed to be 14.

for d:

f(2) = 4 + 9

f(2)= 13

d is a solution.

check