Multiply the polynomials using the special product formulas. Express the answer as a single polynomial in standard form.(3x + y)(3x - y)
A. 9x2 + 6xy - y2
B. 9x2 - y2
C. 6x2 - y2
D. 9x2 - 6xy - y2
Answer: B
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Write the quotient in the form a + bi.
A. 
+ 
i
B. - 
+ 
i
C. - 
+ 
i
D. 
+ 
i
Rationalize numerator.
A. 
B. 
C. 
D. 
Solve the problem.The paired data below consist of the temperatures on randomly chosen days and the amount a certain kind of plant grew (in millimeters). Use the equation of the least squares line to predict the growth of a plant if the temperature is 79. 
A. 31.27 mm B. 32.53 mm C. 29.61 mm D. 31.90 mm
Estimate the value of the quantity.The graph below shows the rate of natural gas usage (in therms per day) in one household for a 30-day period. Estimate the total number of therms used during this period. Use left endpoints and rectangles with widths of 3 days.
A. 159 therms B. 147 therms C. 136 therms D. 165 therms