Use a finite approximation to estimate the area under the graph of the given function on the stated interval as instructed.f(x) = x2 between x = 3 and x = 7 using a lower sum with four rectangles of equal width.
A. 105
B. 126
C. 117
D. 86
Answer: D
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Solve the problem.The sales tax on a freezer is $21.15 and the sales tax rate is 6%. Find the total cost. Round to the nearest cent.
A. $373.65 B. $323.29 C. $444.15 D. $56.40
Factor the trinomial completely.96x2 + 56xy + 8y2
A. 8(3x + y)(4x + y) B. (24x + 8y)(4x + y) C. 8(3x - y)(4x - y) D. prime
Solve the problem.A survey of the interest rates earned by Certificates of Deposit (CDs) showed the following percents for the length of time (in years) for holding the CD. Let length of time represent the independent variable and interest rate represent the dependent variable. Use a graphing utility to draw a scatter diagram and to find the line of best fit. What is the estimate of the interest rate for a CD held for 30 years (to the nearest thousandth)? 
A. 8.669 B. 9.064 C. 8.874 D. 8.675
Find the product.(x + 4)(-3x - 2)
A. -3x2 - 14x - 8 B. -3x2 - 16x - 8 C. -3x2 - 8x - 14 D. -3x2 - 14x - 14