Simplify.8 ? 6 - 4 ? 9
A. 396
B. 144
C. 1728
D. 12
Answer: D
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Express the exercise as a system of linear equations, then find the solution. Use a calculator where appropriate.Natasha rides her bike (at a constant speed) for 4 hours, helped by a wind of 3 miles per hour. Pedaling at the same rate, the trip back against the wind takes 10 hours. Find find the total round trip distance she traveled.
A. 40 mi B. 20 mi C. 14 mi D. 80 mi
For the given demand function, find the value(s) of x for which total revenue is a maximum.x = D(x) = 
A. 800
B. 400
C. 200
D. 
Find an equation for the circle.Center (8, 10), tangent (touching at one point) to the x-axis
A. (x - 10)2 + (y - 8)2 = 10 B. (x - 8)2 + (y - 10)2 = 64 C. (x - 10)2 + (y - 8)2 = 64 D. (x - 8)2 + (y - 10)2 = 100
Graph the numbers on the number line.-3.75, -1, 1, 3.25 
A.
B.
C.
D.
