Write an equation that expresses the relationship. Use k as the constant of variation.p varies jointly as the square of q and the square of r.
A. p = k + q2 + r2
B. p = kq2r2
C. p + q2 + r2 = k
D. pq2r2 = k
Answer: B
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Write an equivalent sentence for the statement.If it is raining, you take your hat. (Hint: Use the fact that p ? q is equivalent to 
A. It is not raining and you take your hat. B. It is not raining or you take your hat. C. It is not raining and you do not take your hat. D. If it is raining, you do not take your hat.
Simplify. Do not use negative exponents in your answer.x ? x-8
A. 
B. x9
C. 
D. x7
Solve the problem.If tan-1 x is replaced by 
and |x| < 0.6, what estimate can be made of the error?
A. |E| < 0.0039991 B. |E| < 0.0046656 C. |E| < 0.0066651 D. |E| < 0.0077760
Use duality to solve the problem.Minimizew = 4y1 + 2y2subject to:3y1 + 2y2 ? 60 4y1 + y2 ? 40 y1 ? 0, y2 ? 0
A. 48 B. 64 C. 66 D. 80