Question

Someone please help , how do you solve this ?

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)?

$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

the x intercept is the value of x when y = 0
and y intecept is value of y when x = 0

so to find the x intercept
solve for x :-
3x - 2(0) = 18
3x = 18
x = ?

Answer 2

Hey sorry that was the wrong question because it dosnt make sense it's ... 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)?

Answer 3

That's that same question though...?

Answer 4

Oh gosh nvm , and x=15

Answer 5

wrong. You are multiplying the 3 to x. So you have to divide to get rid of it:

\(\sf\Large \frac{3x}{3}=\frac{18}{3}\)

Answer 6

x=6 then ?

Answer 7

correct

Answer 8

Okay but now what ? What do i do with the 6?

Answer 9

I don't know why @welshfella had you calculate the x-intercept... It is of no importance in the question :/

Answer 10

f(x) = 1.50x + 12.50

They want to know what f(18) = ?

so plug in x=18 and tell me what you get :)

Answer 11

39.5

Answer 12

correct.

Answer 13

so what 2 answer choices can we eliminate?

Answer 14

A & b

Answer 15

good job

and I think welshfella 's comment was for your previous question which you editted :p

Answer 16

Yes it was haha

Answer 17

read this line:

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 do you think would be the answer between C and D?

Answer 18

D

Answer 19

@TheSmartOne

Answer 20

correct, great job :)