Find the least common multiple.9, 15
A. 45
B. 24
C. 135
D. 15
Answer: A
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Calculate the arc length of the indicated portion of the curve r(t).r(t) = (7cos3 6t)j + (7sin3 6t)k; 
? ? t ? 
?
A. 
B. 
C. 21
D. 0
The growth rate G, in cubic feet per acre per year, of a certain forest stand depends on its age A in years. The relationship is
.
A: Make a graph of G versus A. Include ages up to 60 years.B: Explain in practical terms what the graph tells you about the growth rate of the forest stand over the first 60 years.C: At what age does the maximum growth rate occur? Round your answer to whole number.D: What is the maximum growth rate? Round your answer to two decimal places, if necessary.
What will be an ideal response?
For the curve r(t), write the acceleration in the form aTT + aNN.r(t) = 
(1 + t)3/2i + 
(1 - t)3/2j + 1tk
A. a = 
N
B. a = 1
T
C. a = 1
N
D. a = T + 1
N
Find all the critical numbers of the function.f(x) = xe-5x
A. 
B. -5
C. 0
D. e-5x