Determine where the function is increasing and where it is decreasing.f(x) = -x2 - 4x + 5
A. increasing on (9, ?)
decreasing on (-?, 9)
B. increasing on (-2, ?)
decreasing on (-?, -2)
C. increasing on (-?, -2)
decreasing on (-2, ?)
D. increasing on (-?, 9)
decreasing on (9, ?)
Answer: C
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Solve.A glass-cage elevator rises on the outside of a hotel which is h m tall. A person stands 70 m from the base of the elevator. Express the distance d from the person to the elevator as a function of the height x of the elevator. What is the range of d = f(x)?
A. d = 702 + x2: 0 ? d ? 70
B. d = 
: 70 ? d ? 
C. d = 
: d ? 70
D. d = 
: 70 ? d ? 
Solve the equation.3|x - 3| = 18
A. {3, -9} B. {9, -3} C. no solution D. {3}
Find a cofunction with the same value as the given expression.sin
A. cos 
B. sin 
C. sin 
D. cos 
Solve the problem.If Emery has $2,000 to invest at 7% per year compounded monthly, how long will it be before he has $3,300? If the compounding is continuous, how long will it be? (Round your answers to three decimal places.)
A. 0.091 yrs, 0.715 yrs B. 89.65 yrs, 7.44 yrs C. 0.617 yrs, 0.596 yrs D. 7.175 yrs, 7.154 yrs