Solve the problem.An observer to a rocket launch was 800 ft from the take-off position. The observer found the angle of elevation of the rocket as a function of time to be 
Therefore, the height h (in ft) of the rocket was 
Find the time rate of change of height at 
A. 240 ft/s
B. 400 ft/s
C. 1100 ft/s
D. 6700 ft/s
Answer: B
Mathematics
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Evaluate. The differential is exact.
A. 1
B. 3
C. 
D. 0
Mathematics
Simplify the expression.cos(x + ?) cos(? - x) + sin(x + ?) sin(? - x)
A. 1 B. cos(2x + 2?) C. 0 D. sin(2x + 2?)
Mathematics
Find factors or multiples as indicated for the number or numbers given.17; all factors
A. 1, 2, 8, 17 B. 1, 2, 4, 5, 8, 17 C. 1, 17 D. 1, 2, 3, 5, 8, 17
Mathematics
Draw the angle.
A. 
B. 
C. 
D. 
Mathematics