(3a2 – 5ab b2) (–3a2 2b2 8ab) Which of the following shows the sum of the polynomials rewritten with like terms grouped together? [3a2 (–3a2)] (–5ab 8ab) (b2 2b2) [3a2 (–3a2)] (–5ab 2b2) (b2 8ab) [3a2 3a2] (5ab 8ab) (b2 2b2) [3a2 3a2] (5ab 2b2) (b2 8ab)

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Two technicians are discussing how to test a car's exhaust by holding a small piece of paper within an inch of the tailpipe mouth. technician a says that if the paper is vibrating due to a "puffing" output from the tailpipe, this signals a smoothly running engine. technician b says that if the paper is being drawn toward the tailpipe, this could indicate burned exhaust valves. who is correct? a. technician b b. both technicians a and b c. technician a d. neither technicians a or b

Heights of men on a baseball team have a bell-shaped distribution with a mean of 177 cm and a standard deviation of 6 cm. using the empirical rule, what is the approximate percentage of the men between the following values? a. 159 cm and 195 cm b. 165 cm and 189 cm a. 89% of the men are between 159 cm and 195 cm. (round to one decimal place as needed.) b. 89% of the men are between 165 cm and 189 cm. (round to one decimal place as needed.)