The position vector of a particle is r(t). Find the requested vector.The velocity at t = 
for r(t) = 5sec2(t)i - 10tan(t)j + 4t2k
A. v
= 20i + 20j - 2?k
B. v
= -20j - 2?k
C. v
= -20j + 2?k
D. v
= 20i - 20j + 2?k
Answer: D
Mathematics
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dx = 
sin x + C
A. Yes B. No
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A. 
B. 
C. 
D. 
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Use a calculator to find the sum. Round the result to two decimal places.- 
+ 
A. -31.12 B. 1.35 C. -0.68 D. -1.35
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Solve the combined inequality and graph the solution set. Write the solution in interval notation.-27 ? -4x + 1 ? -7
A. [-7, -2]
B. (-7, -2)
C. (2, 7)
D. [2, 7]
Mathematics