The general term of a sequence is given. Find the indicated partial sum.a1 = 2, an = an - 1 + 5 for n ? 2; S5
A. 55
B. 100
C. 60
D. 85
Answer: C
Mathematics
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Find the center of mass of the thin rod with the given density function.Find the center of mass of a thin rod that lies along the first-quadrant portion of the circle 
if the density of the rod is 
A. 
= 
, 
= 
B. 
= 1, 
= 1
C. 
= 
, 
= 
D. 
= 
, 
= 
Mathematics
Find the second derivative of the function.y = 
A. 
= 
+ 
- 
B. 
= 
- 
+ 
C. 
= 
+ 
- 
D. 
= - 
+ 
- 
Mathematics
Solve the problem. Write ratios in simplest form.A certain lake is 1200 feet deep. A nearby lake is 1100 feet deep. Write the ratio of the first lake's depth to the second lake's depth.
A. 
B. 
C. 
D. 
Mathematics
Factor by grouping.20x6 + 7x3 - 6
A. 20(x3 - 2)(x3 + 3) B. (4x3 + 1)(5x3 - 6) C. (5x3 + 2)(4x3 - 3) D. (4x3 + 3)(5x3 - 2)
Mathematics