Simplify the given expression.
(
n) + 6(n - 1) + 2(
n) + 6 + n
A. 13n
B. 
n
C. 12n + 1
D. 12n
Answer: A
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Find the work done by F over the curve in the direction of increasing t.F = xyi + 3j + 5xk; C: r(t) = cos 2ti + sin 2tj + tk, 0 ? t ? 
A. W = 0
B. W = 
C. W = 
D. W = 
Determine the vertex of the graph of the parabola.y = -5x + 2x2 - 7
A. 
B. 
C. 
D. 
Solve the problem.An athlete uses three different exercise regimens for increasing cardiovascular fitness. An hour of regimen A rates a 3 in effectiveness, an hour of regimen B rates a 4 in effectiveness, and an hour of regimen C rates a 5 in effectiveness. In any given week, the athlete can train at most 4 hours by regimen A. In any given week the combined hours of regimens A and C may not exceed 8. In any given week the combined hours of regimens B and C may not exceed 10. How many hours of each regimen should the athlete perform in a week in order to maximize the increase in fitness?
A. 3 hours of regimen A, 5 hours of regimen B, 5 hours of regimen C B. 4 hours of regimen A, 6 hours of regimen B, 4 hours of regimen C C. 0 hours of regimen A, 2 hours of regimen B, 8 hours of regimen C D. 2 hours of regimen A, 4 hours of regimen B, 12 hours of regimen C
Evaluate.x + 4, for x = 4
A. 0 B. 16 C. 22 D. 8