A solar oven uses a parabolic reflector to focus the sun's rays at a point 7 inches from the vertex of the reflector (see figure).
L = 7 inches
?
Write an equation for a cross section of the oven's reflector with its focus on the positive y axis and its vertex at the origin.
A. 
B. 
C. 
D. 
E. 
Answer: C
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Solve.A hardware store took an inventory of its paint. They had 1.5 times as many gallons of red paint as of blue paint. They had 14 more gallons of yellow paint than red paint. Taken together, the red, yellow and blue paint came to 238 gallons. How many gallons of blue paint were there? Round to the nearest gallon.
A. 75 gallons B. 28 gallons C. 56 gallons D. 84 gallons
Solve the inequality graphically.x2 - 6x + 8 ? 0
A. (-?, 2] B. [2, 4] C. (-?, 2] ? [4, ?) D. [4, ?)
Find the coefficient of the given term in the binomial expansion.x7y2 term, (x + y)9
A. 181,440 B. 7 C. 25,920 D. 36
Use the simplex method to solve the linear programming problem.Maximizez = 4x1 + 2x2subject to:2x1 + 3x2 ? 6 x1 + 3x2 ? 4 2x1 + 2x2 ? 8withx1 ? 0, x2 ? 0
A. Maximum is 8 when x1 = 0, x2 = 2 B. Maximum is 12 when x1 = 3, x2 = 0 C. Maximum is 16 when x1 = 4, x2 = 0 D. Maximum is 6 when x1 = 0, x2 = 3