The graph below shows Brett's salary history during his first seven years at his current job. Use this graph to answer the question. Round to the nearest tenth of a percent. 
What is the percent of increase in Brett's salary between his sixth and seventh year at the job?
A. 6.3%
B. 7.7%
C. 93.8%
D. 6.7%
Answer: D
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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
Tell whether the angle is acute, right, obtuse, straight, or reflex.
A. Obtuse B. Zero C. Straight D. Acute
Use a calculator or the square root table to approximate the square root to the nearest thousandth.
A. 14.288 B. 14.280 C. 14.283 D. 204.000
Add, subtract, or multiply, as indicated. Express your answer as a single polynomial in standard form.(6x2 + 5x + 9) + (4x2 + 6x + 9)
A. 10x2 + 11x + 18 B. 10x2 - 11x + 18 C. 10x2 + 11x - 18 D. 13x2 + 12x + 14