Perform the subtraction. 
A. 21
B. 31
C. 13
D. 89
Answer: A
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Decide whether or not the given equation is an identity.cos(x - ?) = cos x
A. Yes B. No
Solve.A nail 6
inches long is driven into a board 3
inches thick. How much of the nail protrudes from the other side of the board?
A. 5
in.
B. 2
in.
C. 
in.
D. 
in.
Find the expected value.Mr. Cameron is sponsoring an summer concert. He estimates that he will make $300,000 if it does not rain and make $60,000 if it does rain. The weather bureau predicts the chance of rain is 0.34 for the day of the concert. An insurance company is willing to insure the concert for $150,000 against rain for a premium of $30,000. If he buys this policy, what are his expected earnings from the concert?
A. $180,000 B. $300,000 C. $270,000 D. $239,400
Refer to the figure in which 
? 
and 
? 
. 
If CD = 12 m and AB = 25 m, find AD. (a) 16m (b) 20m (c) 24m (d) 50m