If you are driving at a constant speed, the distance you travel is proportional to the time you spend driving. Using D for the distance traveled, in miles, t for the time, in hours, that you drive, and r for the constant of proportionality, express the proportionality relation using a formula.
?
A. 
B. 
C. 
D. 
Answer: A
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Solve.Using the chessboard parable, find the total weight (in pounds ) when all squares up to and including 19 are filled. Assume that each grain of wheat weighs 1/7000 pound. Round your answer to the nearest pound.
A. 37 pounds B. 5 pounds C. 75 pounds D. 19 pounds
Solve the problem.The system of equations 
= (-2 + 3y)x and 
= (-2 + x)y describes the growth rates of two symbiotic (dependent) species of animals (such as the rhinoceros and a type of bird which eats insects from its back). What happens to the rhinoceros population when the bird population decreases?
A. The rhinoceros population could either increase or decrease. B. The rhinoceros population stays the same. C. The rhinoceros population decreases. D. The rhinoceros population increases.
Completely factor the polynomial or state that the polynomial is prime.(x + 6)2 - 7(x + 6) + 10
A. (x2 - 6x + 2)(x2 - 6x + 5) B. (x + 8)(x + 11) C. (x2 + 6x - 2)(x2 + 6x - 5) D. (x + 4)(x + 1)
Find decimal notation.
A. 0.452 B. 0.302 C. 0.372 D. 0.352