Solve.A planet orbits the sun every 31.9 years. Write this decimal in words.
A. thirty-one and nine hundredths
B. thirty-one and nine tenths
C. thirty-one and nine thousandths
D. thirty-one and nine millionths
Answer: B
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Find the probability.What is the probability that 20 rolls of a fair die will show 8 threes? Round to the nearest ten-thousandth.
A. 0.0017 B. 0.0168 C. 0.0084 D. 0.0042
Solve.AAA Technology finds that the total revenue function associated with producing a new type of computer chip is 
and the total cost function is 
where x represents the number of units of chips produced. Find the total profit function, P(x) .
A. P(x) = -0.03x2 + 8x - 40 B. P(x) = 0.03x2 + 8x + 42 C. P(x) = -0.03x2 - 8x + 40 D. P(x) = -0.03x2 + 8x + 76
Solve the system of equations by the elimination method.-6x + 5y = 362x + 2y = -12
A. no solution B. (-6, 0) C. (-6, 1) D. (-7, 1)
Solve the problem.A painter can finish painting a house in 4 hours. Her assistant takes 6 hours to finish the same job. How long would it take for them to complete the job if they were working together?
A. 3 hr
B. 
hr
C. 5 hr
D. 2
hr