The final price is the cost plus the tax.
Since we know the tax and a percent, we can write this as
T = C(1+r)
T = what Graham paid = $87.45
C = cost before tax
r = tax rate expressed as a decimal = .40
Plugging in what we know
87.45 = C (1+.4)
87.45 = C(1.4)
Divide both sides by 1.4
C = $62.46
Answer: 6.25 is her profit
Step-by-step explanation: cost-price= protect
2.25 - 8.50=6.25
Answer: X= -1
Step-by-step explanation:

I really don't know, what the answer is...
But, I think it is....
C. 38 miles.
Hopefully, this helps you!!

Answer:
Step-by-step explanation:
The answers you get for zeros are - 8 1 and - 6.
I'm not sure what you are looking for.