On math!

beth's monthly charge for internet access c is represented by the function c = 12 + 2.50h, where h represents the number of hour of usage during a month. what is the total charge for a month in which beth used the internet for 9 hours?

a. $39.95
b. $34.50
c. $27.00
d. $22.50

Marco has $38.43 dollars in his checking account. his checking account is linked to his amazon music account so he can buy music. the songs he purchases cost $1.29. part 1: write an expression to describe the amount of money in his checking account in relationship to the number of songs he purchases. part 2: describe what the variable represents in this situation.

Polynomial that can be factored as (3x-4)(3x+4)

How do you solve a question like this?