Solve the problem.To remodel a bathroom, a contractor charges $25 per hour plus material costs, which amount to $3900. Therefore, the total cost to remodel the bathroom is given by 
where x is the number of hours the contractor works. Find a formula for 
What does 
compute?
A. f -1(x) = 
- 156; This computes the total cost if the contractor works x hours.
B. f -1(x) = 
- 3900; This computes the number of hours worked if the total cost is x dollars.
C. f -1(x) = 
- 156; This computes the number of hours worked if the total cost is x dollars.
D. f -1(x) = 
- 3900; This computes the total cost if the contractor works x hours.
Answer: C
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Provide an appropriate response.Perform the indicated operations: 42 + 
=
A. 32 B. 12 C. 0 D. 20
Solve the equations.x2 = 144
A. ±13 B. ±12 C. 12 D. 72
Solve the formula for the indicated variable.S = 2?rh + 2?r2 for h
A. h = 
B. h = 
- 1
C. h = 2?(S - r)
D. h = S - r
Use Cramer's Rule to solve the system of equations. Use technology to compute the determinants involved.
A. {(9, 5, 1)} B. {(8, -7, -1)} C. {(8, 7, 1)} D. {(7, 1, 7)}