Estimate the answer to the problem.An appliance store sells 38 refrigerators a week. Without finding the exact amount, calculate the total amount of money the store makes in a week if each refrigerator costs $938.
A. $30,000
B. $40,000
C. $27,000
D. $36,000
Answer: D
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Solve the equations.x2 = 144
A. ±13 B. ±12 C. 12 D. 72
Solve the problem.Suppose a cold front is passing through the United States at noon with a shape described by the function 
where each unit represents 100 miles. 
Missouri is located at 
and the positive y-axis points north.N
/> 
SSuppose the front moves south 340 miles and west 120 miles and maintains its shape. Give the equation for the new front and plot the new position of the front.
A. y = - 
(x + 1.2)2 - 3.4
| N |
| S |
B. y =
(x - 1.2)2 + 3.4| N |
| S |
C. y =
(x - 1.2)2 - 3.4| N |
| S |
D. y =
(x + 1.2)2 - 3.4| N |
| S |
Solve the problem.Wildlife management personnel use predator-prey equations to model the populations of certain predators and their prey in the wild. Suppose the population M of a predator after t months is given by M = 750 + 125 sin 
twhile the population N of its primary prey is given by N = 12,250 + 3050 cos 
tFind the period for each of these functions.
Fill in the blank(s) with the appropriate word(s).
Simplify the expression.(1 + cot ?)(1 - cot ?) - csc2 ?
A. 2 B. 0 C. -2 cot2 ? D. 2 cot2 ?