Write a formula for the general term (the nth term) of the geometric sequence.7, -14, 28, -56, 112, . . .
A. an = 7(-2n)
B. an = 7(-2)n
C. an = a1 - 2n
D. an = 7(-2)n - 1
Answer: D
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Find the unit tangent vector of the given curve.r(t) = (1 + 10t2)i + (3 + 11t2)j + (3 + 2t2)k
A. T = 
i + 
j + 
k
B. T = 10i + 11j + 2k
C. T = 
i + 
j + 
k
D. T = 
i + 
j + 
k
Simplify.
A. - 
B. 
C. 
D. - 
Solve the problem.Tim and Judy mix two kinds of feed for pedigreed dogs. They wish to make 31 pounds of feed worth 
per pound by mixing one kind worth 
per pound with another worth 
per pound. How many pounds of the cheaper kind should they use in the mix? (Round to the nearest whole number)
A. 15 pounds B. 16 pounds C. 21 pounds D. 17 pounds
Let p represent a true statement, and let q and r represent false statements. Find the truth value of the given compound statement.~(~p ? ~q) ? (~r ? ~p)
A. True B. False