Factor the expression.9x3 + 15x2 - 3x
A. 3x(3x2 + 5x + 1)
B. 3(3x3 + 5x2 - x)
C. 3x(3x2 + 5x - 3)
D. 3x(3x2 + 5x - 1)
Answer: D
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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
Find the average rate of change for the function between the given values.f(x) = x2 + 8x; from 1 to 7
A. 
B. 15
C. 16
D. 
Provide an appropriate response.The function f(x, y) = 
x3 + 
y2 + xy - 6x + 3 has a relative minimum at
A. (-2, 2). B. (2, -2). C. (-3, 3). D. (2, 2). E. (3, -3).
Forces F1 and F2 act at the same point. Find the resultant force F and its magnitude.F1 = 
i + 
j, F2 = - 
i + 
j
A. F = - 
i - 
j ; 
= 
B. F = 
i + 
j ; 
= 
C. F = - 
i + 
j ; 
= 
D. F = 
i + 
j ; 
= 