Question

The function f(x) = 1.50x + 12.50 relates how much Kelsey pays for digital service, f(x), to the number of movies, x, she streams in a month. What is the value and meaning of f(18)? (5 points)
$27.00; this is the amount Kelsey pays for 18 months of service
$27.00; this is the amount Kelsey pays for 18 movies in 1 month
$39.50; this is the amount Kelsey pays for 18 months of service
$39.50; this is the amount Kelsey pays for 18 movies in 1 month

Answer 1

Hi there! f(18) makes the value of x 18 and x is the number of movies watched in 1 month. Therefore, A and C are eliminated because we’re talking 18 movies, not 18 months. B is also out, because Kelsey would pay more than $27 a month for the service, especially with the service fee. 18 * 1.50 is 27 and 27 + 12.50 is 39.50. Kelsey spends $39.50 a month watching 18 movies per month. The answer is D.