10, 8, 6, 4...

What is a20 in this arithmetic sequence?

A) -32

B) -30

C) -28

D) -26

E) -24

A hair salon charges a fixed rate of $25.00 for a haircut and then an additional $15 for any other services. Write a function to model the cost of services there and then determine how many services you had if you were charged $115

A) f(x) = 15x + 25; f(6) = 115

B) f(x) = 25x + 15; f(6) = 165

C) f(x) = 15x + 25; f(6) = 125

D) f(x) = 15x + 25; f(115) = 1750

E) f(x) = 25x + 15; f(115) = 2890

Guest Oct 2, 2019

#1**0 **

We can see that it goes down by 2 each time.

We can write an equation.

-2x+12 is the equation where x is the place of the number (so if x = 1, then it will be the 1st number)

Then -2(20)+12 = -28, or answer C

CoolStuffYT Oct 2, 2019