Simplify the complex fraction.
A. 
B. 
C. 
D. 72y(y + 3)
Answer: A
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Use the graph of the function f(x) to locate the local extrema and identify the intervals where the function is concave up and concave down.
A. Local minimum at x = 0; local maximum at x = 2; concave down on (0, ?); concave up on (-?, 0) B. Local minimum at x = 0; local maximum at x = 2; concave up on (0, ?); concave down on (-?, 0) C. Local minimum at x = 2; local maximum at x = 0; concave down on (0, ?); concave up on (-?, 0) D. Local minimum at x = 2; local maximum at x = 0; concave up on (0, ?); concave down on (-?, 0)
Multiply.
A. 23,210 B. 23,190 C. 23,196 D. 23,200
Solve the system of equations by the substitution method.
A. (5, -5) B. infinite number of solutions C. (0, 15) D. no solution
The currents in an electrical network are given by the solutions of the system
where I1, I2, and I3 are measured in amperes. Solve the system of equations using matrices.
A. I1 = 2, I2 = 3, I3 = 1 B. I1 = 2, I2 = 1, I3 = 3 C. I1 = 4, I2 = 4, I3 = 9 D. I1 = 4, I2 = 4, I3 = 8 E. no solution