Find the circumference of the circle. Use 3.14 or 
for ? as indicated.Use 3.14 for ?.
A. 147.58 mi
B. 73.79 mi
C. 6936.26 mi
D. 295.16 mi
Answer: A
Mathematics
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The position vector of a particle is r(t). Find the requested vector.The acceleration at t = 
for r(t) = (2 sin 5t)i - (10 cos 5t)j + (9 csc 5t)k
A. a
= -50i - 225k
B. a
= 50i + 225k
C. a
= 250j + 225k
D. a
= -50i + 225k
Mathematics
Determine whether the given geometric series is convergent or divergent, and find the sum if it is convergent.5 + 20 + 80 + 320 + ...
A. Convergent; S = 425 B. Convergent; S = 320 C. Divergent D. Convergent; S = 325
Mathematics
Find the logarithm. Give an approximation to four decimal places.ln 0.000691
A. 3.1605 B. 7.2774 C. -7.2774 D. -3.1605
Mathematics
Evaluate the piecewise-defined function at the indicated value.f(x) = 
; f(-2)
A. -4 B. 14 C. -9 D. 11
Mathematics