Use polar coordinates to find the limit of the function as (x, y) approaches (0, 0).f(x, y) = cos-1
A. ?
B. 
C. 1
D. No limit
Answer: B
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Use identities to simplify the expression.cot x sec x sin x
A. tan2 x B. sec2 x C. csc2 x D. 1
Give an appropriate answer.Given the function f(x, y, z) and the positive number ? as in the formal definition of a limit, find a positive number ? as in the definition that insures 
< ?.f(x, y, z) = sin2x + sin2y + sin2z ; ? = 0.09
What will be an ideal response?
Solve the variation problem.The amount of water used to take a shower is directly proportional to the amount of time that the shower is in use. A shower lasting 22 minutes requires 15.4 gallons of water. Find the amount of water used in a shower lasting 4 minutes.
A. 3.5 gallons B. 2.1 gallons C. 2.8 gallons D. 88 gallons
Solve the problem.
Barbara knows that she will need to buy a new car in 6 years. The car will cost $15,000 by then. How much should she invest now at 8%, compounded quarterly, so that she will have enough to buy a new car?
A. $8752.36 B. $9325.80 C. $11,854.72 D. $10,208.75