Find the exact or approximate circumference of the circle, as indicated.Find the exact circumference.
A. 32.5? km
B. 4225? km
C. 65? km
D. 130? km
Answer: C
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The position vector of a particle is r(t). Find the requested vector.The acceleration at t = 
for r(t) = (10t - 5t3)i + 2tan(3t)j + e3tk
A. a
= - 
?i - 72j + 9e1/4?k
B. a
= - 
?i - 72j + 9k
C. a
= - 
?i + 72j + 9e1/4?k
D. a
= 
?i + 72j + 9e1/4?k
Evaluate the improper integral or state that it is divergent. 
A. 2
2
B. 4 ln
C. 4 ln 
D. 4 ln 2
Solve the problem.A single die is rolled. Find the odds against getting a number less than 4.
A. 3:2 B. 1:2 C. 1:1 D. 2:1
Write the digits for the given period (group) in the whole number.14,000,788millionsthousandsones
A. millions 000 thousands 14 ones 88 B. millions 14 thousands 000 ones 8 C. millions 14 thousands 000 ones 788 D. millions 1 thousands 0 ones 8