In each group of four products, one is wrong. Use estimation to determine which product is incorrect.
A. 140 × 42 = 5880
B. 54 × 362 = 19,658
C. 548 × 87 = 47,676
D. 268 × 56 = 15,008
Answer: B
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Show that the equation is not an identity by finding a value of x for which both sides are defined but not equal.cos 5x + cos 12x = 2 cos 7x cos x
A. 2?
B. -2?
C. 
D. 0
Rewrite the expression using the Distributive Property and simplify the result.4(5m + 9)
A. 20m + 36 B. 180m C. 5m + 36 D. 20m + 9
Graph the ellipse and locate the foci.
+ 
= 1
A. foci at (
, 0) and (-
, 0)
B. foci at (2
, 0) and (-2
, 0)
C. foci at (2
, 0) and (-2
, 0)
D. foci at (0, 2
) and (0, -2
)
Solve the problem.To remodel a bathroom, a contractor charges $30 per hour plus material costs, which amount to $4770. 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) = 
- 4770; This computes the number of hours worked if the total cost is x dollars.
B. f -1(x) = 
- 159; This computes the total cost if the contractor works x hours.
C. f -1(x) = 
- 159; This computes the number of hours worked if the total cost is x dollars.
D. f -1(x) = 
- 4770; This computes the total cost if the contractor works x hours.