For the curve r(t), find an equation for the indicated plane at the given value of t.r(t) = (t + 9)i + (ln(cos t) - 8)j + 8k, -?/2 < t < ?.2; rectifying plane at t = 
.
A. 
- 
= 0
B. - 
+ 
= 0
C. 
(x - (1 + 9)) = 0
D. 
+ 
= 0
Answer: D
Mathematics
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Find the convergence set for the given power series. Hint: First find a formula for the nth term; then use the Absolute Ratio Test.1 + 
+ 
+ 
+ . . .
A. 0 ? x < 9 B. -9 < x < 1 C. -5 < x < -3 D. All x
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Convert to logarithmic form.32 = 9
A. log 3 2 = 9 B. log 2 9 = 3 C. log 9 3 = 2 D. log 3 9 = 2
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Solve the problem.Find the center of mass of the hemisphere of constant density bounded 
and the 
A. 
= 0, 
= 0, 
= 
B. 
= 0, 
= 0, 
= 
C. 
= 0, 
= 0, 
= 
D. 
= 0, 
= 0, 
= 1
Mathematics
Use the given triangles to evaluate the expression. Rationalize all denominators. 
tan 
- sin 
A. 
B. - 
C. 
D. - 
Mathematics