Factor by grouping.5x + 35 + xy + 7y
A. (x + 7y)(5 + y)
B. (y + 7)(5x + y)
C. (x + 7)(5 + y)
D. (y + 7)(x + 5)
Answer: C
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In a certain lake the intensity of light from the surface decreases by 40% for each additional meter of depth.
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A: Explain why light intensity is an exponential function of depth.
?
B: Using 
for intensity at the surface of the lake, write a formula that gives the intensity I of light ?d meters below the surface.
?
C: At what depth will light intensity be one tenth of surface intensity? Round your answer to two decimal places if necessary.
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What will be an ideal response?
Find all local extreme values of the given function and identify each as a local maximum, local minimum, or saddle point.
A. 
local maximum; 
local minimum
B. 
saddle point; 
saddle point
C. 
local maximum
D. 
local minimum
Find the area.
A. 15
m2
B. 19 m2
C. 9
m2
D. 7
m2
Factor the polynomial f(x). Then solve the equation f(x) = 0.f(x) = x3 - 9x2 + 23x - 15
A. (x + 1)(x - 3)(x + 5) ; -1, 3, -5 B. (x - 1)(x + 3)(x - 5) ; -1, 3, -5 C. (x - 1)(x - 3)(x - 6) ; 1, 3, 6 D. (x - 1)(x - 3)(x - 5) ; 1, 3, 5