Complete the identity.cos 
= ?
A. - 
(cos x + sin x)
B. 
(cos x - sin x)
C. - 
(cos x - sin x)
D. 
(
cos x - sin x)
Answer: D
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Multiply.
A. t2 + 
t + 
B. t2 - 
C. t2 + 
D. t2 + 
t + 
Tell whether the relation is a function.
A. Function B. Not a function
Solve the problem.An appliance store sells two types of refrigerators. Each Cool-It refrigerator sells for $640 and each Polar sells for $740. Up to 270 refrigerators can be stored in the warehouse and new refrigerators are delivered only once a month. It is known that customers will buy at least 70 Cool-Its and at least 110 Polars each month. How many of each brand should the store stock and sell each month to maximize revenues?
A. 160 Cool-Its and 110 Polars B. 230 Cool-Its and 155 Polars C. 85 Cool-Its and 185 Polars D. 70 Cool-Its and 200 Polars
Solve the problem.A piece of land is shaped like a right triangle. Two people start at the right angle at the same time, and walk at the same speed along different legs of the triangle while spraying the land. If the area covered is changing at 
how fast are the people moving when they are 
from the right angle? (Round approximations to two decimal places.)
A. 1.00 m/sec B. 0.50 m/sec C. 8.00 m/sec D. 0.25 m/sec