Determine whether the function is one-to-one by graphing and using the horizontal line test.f(x) = 7x2 - 4
A. Yes
B. No
Answer: B
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Determine the arithmetic property expressed by the numerical statement.15(10) = 10(15)
A. associative property of multiplication B. associative property of addition C. distributive property D. commutative property of multiplication
Find the ratio.
Solve the problem.A company predicts that sales will increase rapidly after a new product is released, with the number of units sold weekly modeled by N = 3000(0.2)0.7t, where t represents the number of weeks after the product is released. Use graphical or numerical methods to find the first week in which 2250 units were sold.
A. 3rd week B. 5th week C. 6th week D. 7th week
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. 37.5%; $210 million B. 39.6%; $209 million C. 34.9%; $207 million D. 35.8%; $209 million