Find the domain of the composite function f ? g.f(x) = 
; g(x) = 3x + 6
A. {x 
B. {x 
C. {x 
D. {x 
Answer: A
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Solve the problem.Suppose that the revenue from selling x radios is r(x) = 70x - 
dollars. Use the function r '(x) to estimate the increase in revenue that will result from increasing production from 125 radios to 126 radios per week.
A. $45.00 B. $95.00 C. $57.50 D. $44.80
Graph the parabola whose equation is given.y = 4x2 + 40x + 98
A. 
B. 
C. 
D. 
Solve the problem.The amount of a certain drug in the bloodstream is modeled by the function 
, where y0 is the amount of the drug injected (in milligrams) and t is the elapsed time (in hours). Suppose that 10 milligrams are injected at 10:00 A.M. If a second injection is to be administered when there is 1 milligram of the drug present in the bloodstream, approximately when should the next dose be given? Express your answer to the nearest quarter hour.
A. 5:45 P.M B. 12:30 P.M C. 3:45 P.M D. 5: 30 P.M
Perform the matrix row operation and write the new matrix.
-1R1
A. 
B. 
C. 
D. 