Solve the problem.A cross-section of an irrigation canal is a parabola. If the surface of the water is 48 ft wide and the canal is 
deep at the center, how deep is it 24 ft from the edge?
A. 7 ft
B. 1.8 ft
C. 5.2 ft
D. 0 ft
Answer: A
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Find all the local maxima, local minima, and saddle points of the function.
A. f(0, 0) = 5392, local maximum; f(0, 8) = 1296, saddle point; f(6, 0) = 4096, saddle point;
f(6, 8) = 0, local minimum; f(-6, -8) = 0, local minimum
B. f(0, 0) = 5392, local maximum; f(0, 8) = 1296, saddle point; f(0, -8) = 1296, saddle point;
f(6, 0) = 5392, saddle point; f(6, 8) = 0, local minimum; f(6, -8) = 0, local minimum;
f(-6, 0) = 4096, saddle point; f(-6, 8) = 0, local minimum; f(-6, -8) = 0, local minimum
C. f(0, 0) = 5392, local maximum; f(6, 8) = 0, local minimum; f(6, -8) = 0, local minimum;
local minimum; f(-6, -8) = 0, local minimum
D. f(0, 0) = 5392, local maximum; f(-6, -8) = 0, local minimum
Factor and, if possible, simplify the expression.sec4x + sec2x tan2x - 2 tan4x
A. sec2x + 2 B. 3 sec2x - 2 C. 4 sec2x D. tan2x - 1
Solve the problem.How many different amounts of money can you pay if you use four coins including dimes and quarters?
A. 6 amounts B. 3 amounts C. 4 amounts D. 5 amounts
Evaluate the expression.-7 - 7
A. 30 B. -30 C. -28 D. 28