Solve the problem.To remodel a bathroom, a contractor charges $30 per hour plus material costs, which amount to $4680. Therefore, the total cost to remodel the bathroom is given by 
where x is the number of hours the contractor works. Find 
What does 
compute?
A. f -1(x) = 
- 4680; This computes the number of hours worked if the total cost is x dollars.
B. f -1(x) = 
- 4680; This computes the total cost if the contractor works x hours.
C. f -1(x) = 
- 156; This computes the number of hours worked if the total cost is x dollars.
D. f -1(x) = 
- 156; This computes the total cost if the contractor works x hours.
Answer: C
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x3 + 2x + x2 + 2
A. (x2 + 1)(2x + 1) B. (2x + 1)(x + 1) C. (x2 + 1)(x + 2) D. (x2 + 2)(x + 1)
Form an equivalent expression by rationalizing the denominator.
A. 13
B. 13
C. 1
D. 
Simplify the expression. Assume that all variables represent nonnegative real numbers.3
+ 6
A. 9
B. -3
C. 9
D. 18
Let x represent the number. Write the English phrase as an algebraic expression.Twice the sum of a number and -10.
A. 2x + (-10) B. 2+ x + (-10) C. 2x - (-10) D. 2(x + (-10))