The position vector of a particle is r(t). Find the requested vector.The velocity at t = 
for r(t) = 2sec2(t)i - 4tan(t)j + 7t2k
A. v
= -8j - 
?k
B. v
= -8j + 
?k
C. v
= 8i - 8j + 
?k
D. v
= 8i + 8j - 
?k
Answer: C
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Answer the question.Tell which of the following distributions would have the most variation.
A. The number of hours of light per day over a one-year period in Mexico City B. The number of hours of light per day over a one-year period at the North Pole C. The number of hours of light per day over a one-year period at the equator D. The number of hours of light per day over a one-year period in New York
Solve and check.7(-1)t = -28
A. t = -7 B. t = -4 C. t = 7 D. t = 4
Solve the equation and express the solution in exact form using either ln or log as indicated.
x = -9
Express the answer using ln.
A. {ln 9}
B. {ln -9}
C. 
D. ?
Find the matrix of the quadratic form.6x1x2 - 18x1x3 + 18x2x3
A. 
B. 
C. 
D. 