Solve the problem.Some people treat acid reflux with the drug Pepcid. The number of milligrams N of Pepcid in an adult's bloodstream t hours after a 20 mg tablet is swallowed can be approximated by N = -0.09t(t - 12)3 . Approximately how long after a tablet is swallowed will there be 17 mg in the bloodstream? Use a graphing calculator and round to the nearest hundredth of an hour.
A. 0.08 hr, 9.3 hr
B. 0.13 hr, 9.25 hr
C. 0.19 hr, 9.35 hr
D. 0.11 hr, 9.27 hr
Answer: D
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Solve the problem.Find the slope of the tangent to the curve of the intersection of the surface 2z = 
and the plane x = 1 at the point 
A. 
B. 
C. 
D. 
Factor out the GCF from the polynomial.21x3 - 9x2 + 12x
A. x(21x2 - 9x + 12) B. 3x(7x2 - 3x + 4) C. 3(7x3 - 3x2 + 4x) D. 3x(7x3 - 3x2 + 4x)
Find an equation for the circle.Endpoints of a diameter (-2, -3), (4, -7)
A. (x - 1)2 + y2 = 4 B. (x + 5)2 + (y - 1)2 = 13 C. (x - 1)2 + (y + 5)2 = 13 D. x2 + (y + 5)2 = 9
Solve the problem.Given the following revenue and cost functions, find the maximum profit. (Recall that profit equals revenue minus cost.) R(x) = 53x - 2x2; C(x) = 21x + 100
A. $28 B. $156 C. $228 D. $128