Solve the equation.5(2z - 4) = 9(z + 2)
A. {38}
B. {2}
C. {3}
D. {-2}
Answer: A
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Find all the second order partial derivatives of the given function.f(x, y) = cos xy2
A. fxx(x, y) = y2 sin xy2; fyy(x, y) = 2[2y2 cos (xy2) - sin (xy2)] ; fyx(x, y) = fxy(x, y) = 2y[y2 cos (xy2) - sin (xy2)]
B. fxx(x, y) = -y4 cos xy2; fyy(x, y) = - 2x[2xy2 cos (xy2) + sin (xy2)]; fyx(x, y) = fxy(x, y) = - 2y[xy2 cos (xy2) + sin (xy2)];
C. fxx(x, y) = - y2 sin xy2; fyy(x, y) = 2[ sin (xy2)- 2y2 cos (xy2)] ; fyx(x, y) = fxy(x, y) = 2y [sin (xy2)-y2 cos (xy2)]
D. fxx(x, y) = - y2 sin xy2; fyy(x, y) = 2y
; fyx(x, y) = fxy(x, y) = 2
Use the distributive property to rewrite the algebraic expression without parentheses. Then simplify the result, if possible.- (8x + 8y)
A. -8x - 8y B. -8x + 8y C. 8x + 8y D. 8x - 8y
Solve the problem.A salesperson gets a commission of $800 for the first $10,000 of sales, and then $400 for each additional $10,000 or partial of sales. Let S(x) represent the commission on x dollars of sales. Find the value of 
A. $4400 B. $4200 C. $3800 D. $4600
Find the solution set for the system by graphing both of the system's equations in the same rectangular coordinate system and finding points of intersection.x2 - y2 = 196x2 + y2 = 196 
A. {(0, 14), (0, -14)} B. {(14, 0)} C. {(14, 0), (-14, 0)} D. {(0, 14)}