Question

Suppose that the function

f ( x ) = 2 x + 12 represents the cost to rent x movies a month from an internet movie club. Makayla now has $10. How many more dollars  does Makayla need to rent 7 movies next month ?

Answer 1

Calculating f(7)

f(7) = 2.7 + 12
f(7) = 14 + 12
f(7) = 26

He/She needs 26 - 10 = 16 dollars

Answer 2

`x=7\ \ \ \ \Rightarrow\ \ \ f(x)=2\cdot7+12=14+12=26\ [\$]\\\\\$26-\$10= \$16\\\\Ans.\ Makayla\ need\ \ \ \$16.`