Find the axis of symmetry of the given function.f(x) = -2x2 + 9x + 7
A. x = 
B. x = - 
C. x = 
D. x = - 
Answer: A
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Provide an appropriate response.If f(x, y, z) is differentiable, x = r - s, y = s - t, and z = t - r, show that 
What will be an ideal response?
Evaluate the definite integral. Express the answer in terms of natural logarithms.
A. ln(
+ 2)
B. ln
C. ln(
+ 
)
D. ln(
+ 3)
Magazine circulation after t years is modeled by the function
.
?
When was the circulation increasing at the fastest rate? Round your answer to two decimal places.
?
A. After 4.90 years B. After 3.35 years C. After 3.67 years D. After 3.54 years
Solve the problem.Bob is driving along a straight and level road straight toward a mountain. At some point on his trip he measures the angle of elevation to the top of the mountain and finds it to be 
He then drives 1 mile 
more and measures the angle of elevation to be 
Find the height of the mountain to the nearest foot.
A. 554,134 ft B. 55,413 ft C. 5641 ft D. 5541 ft