Use the following graph which shows the monthly sales of a heating supplier. 
What was the percent of increase in sales from April to July?
A. 14.9%
B. 17.5%
C. 14.3%
D. 44%
Answer: B
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Solve the problem.A 2000-L tank is initially filled with a copper sulfate solution with a concentration of 50 g/L. A copper sulfate solution with a concentration of 20 g/L flows into the tank at a rate of 15 L/min. The thoroughly mixed solution is drained from the tank at a rate of 15 L/min.(a) Write an initial value problem for the mass of the copper sulfate.(b) Solve the initial value problem.
A. (a) m'(t) = -0.007m + 300, m(0) = 100,000 (b) m = 60,000e-0.007t + 40,000 B. (a) m'(t) = -0.007m + 20, m(0) = 50 (b) m = -39,950e-0.007t + 40,000 C. (a) m'(t) = 0.008m + 300, m(0) = 50 (b) m = -39,950e0.008t + 600,000 D. (a) m'(t) = -133.333m + 300, m(0) = 100,000 (b) m = 60,000e-0.007t + 600,000
Use the linear approximation (1 + x)k ? 1 + kx, as specified.Find an approximation for the function f(x) = 
for values of x near zero.
A. f(x) ? 1 + 2x B. f(x) ? 1 - 2x C. f(x) ? 2 - 2x D. f(x) ? 2 + 2x
Graph the system of inequalities. Shade the region that represents the solution set.x2 + y2? 16x + y< 2
A. 
B. 
C. 
D. 
A television camera is on a reviewing platform a meters from the street on which a parade will be passing from left to right (see figure). Write the distance d from the camera to a particular unit in the parade as a function of the angle x.
a = 26.
A. d = 26tan x B. d = 26sec x C. d = 26cos x D. d = 26cot x E. d = 26sin x