Answer:
amplitude; 
Phase shift;
units right
Period;
Step-by-step explanation:
The given function is

This function is of the form;

The period is given by:

The period is given by:

The phase shift is given by;
or
units right.
Multiply the price by (1 + sales tax).
85 x (1+0.07)
85 x 1.07 = 90.95
He will pay $90.95