Write the expression in the standard form a + bi.(5 + 5i)(7 + 2i)
A. 10i2 + 45i + 35
B. 45 + 25i
C. 25 + 45i
D. 25 - 45i
Answer: C
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Solve for the indicated variable.Solve H = 
for F.
A. F = 
B. F = 
C. F = 
D. F = H
Graph the solution set of the inequality or system of inequalities.y ? - 2x - 1x - y ? -1
A. 
B. 
C. 
D. 
Solve the problem.A rectangular board is 2 ft by 12 ft. How far from the center of the board should the foci be located in order to cut the largest elliptical tabletop from the board?
A. 0.1 ft B. 1.0 ft C. 5.0 ft D. 5.9 ft
Solve the problem.Economists use what is called a Leffer curve to predict the government revenue for tax rates from 0% to 100%. Economists agree that the end points of the curve generate 0 revenue, but disagree on the tax rate that produces the maximum revenue. Suppose an economist produces this rational function,
where R is revenue in millions at a tax rate of x percent. Use a graphing calculator to graph the function. What tax rate produces the maximum revenue? What is the maximum revenue?
A. 39.6%; $209 million B. 37.5%; $210 million C. 34.9%; $207 million D. 35.8%; $209 million