Answer:

Step-by-step explanation:
Given
--- initial
-- rate
Value after a year = $20.70
Required
Expression to calculate its value after y years
This is calculated using:

Where

Substitute
in 



Substitute
and
in 

Answer:
B
Step-by-step explanation:
I don't want to do the work but It doesn't look like you need it so I'm good Also why did you ask a different question than in your picture
10 20 30 40 50 60 70 80 90 100 .....
Answer:
A
Step-by-step explanation:
(0,-3), (2,-2), (4, -1), (6,0) are on the line and (6, 0) is A
Subtract the rental fee, then divide the left over amount by the cost per hour.
38-10 = 28
28 / 7 = 4
The answer is 4 hours.