Write out the sum and evaluate.
A. 
2+ 
2 + 
2 + 
2 + 
2; 441
B. 
+ 
+ 
+ 
+ 
; 441
C. 
+ 
+ 
+ 
+ 
; 121
D. 
+ 
+ 
+ 
+ 
; 121
Answer: B
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Find the center of mass of the wire that lies along the curve r and has density ?.r(t) = (6t2 - 2)i + 3tk, -1 ? t ? 1; 
A. 
B. 
C. 
D. 
Factor by grouping.12c3 - 2c2d + 54cd2 - 9d3
A. (6c + 9d2)(2c2 - d) B. (6c - d2)(2c2 + 9d) C. (6c - d)(2c2 + 9d2) D. (6c + 9d)(2c2 - d2)
Solve the problem.The charges for renting a moving van are $65 for the first 30 miles and $8 for each additional mile. Assume that a fraction of a mile is rounded up. (i) Determine the cost of driving the van 99 miles. (ii) Find a symbolic representation for a function f that computes the cost of driving the van x miles, where 
(Hint: express f as a piecewise-constant function.)
A. $1097;
f(x) = 
B. $617;
f(x) = 
C. $6987;
f(x) = 
Use the order of operations to simplify the expression.
÷ 
? 
A. 
B. 
C. 
D. 