Factor the trinomial completely.x2 + 6xy - 135y2
A. (x + 15y)(x - 9y)
B. (x - 15y)(x + 9y)
C. Prime
D. (x - 15y)(x + y)
Answer: A
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Suppose 500 coins are tossed. Using the normal curve approximation to the binomial distribution, find the probability of the indicated results.Exactly 250 heads
A. .040 B. .016 C. .031 D. .032
Determine the average rate of change for the function.f(x) = 
x - 1
A. -1
B. 1
C. 
D. - 
The graph of a logarithmic function is shown. Select the function which matches the graph.
A. y = 1 - log2x B. y = log2(-x) C. y = log2x D. y = -log2x
Use a graphing calculator to plot the data and find the quadratic function of best fit.A small manufacturing firm collected the following data on advertising expenditures (in thousands of dollars) and total revenue (in thousands of dollars). Find the quadratic function of best fit. Round values to the nearest thousandth. 
A. R(x) = -0.091x2 + 5.952x + 6337.167 B. R(x) = -0.0242x2 + 7.139x + 6209.323 C. R(x) = -0.015x2 + 4.536x + 6123.841 D. R(x) = -0.310x2 + 2.631x + 6128.455