Solve the problem.A bag of marbles has twice as many blue marbles as green marbles, and the bag has at least 42 marbles in it. At least how many green marbles does it have?
A. At least 28 green marbles
B. At least 15 green marbles
C. At least 14 green marbles
D. At least 21 green marbles
Answer: C
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Solve the problem.Sandy's bike got a flat tire and she must walk the rest of the way to work. The bike was being ridden at 
and Sandy walks at a speed of 4 mph. The distance from home to work is 22 mi, and the total time for the trip was 3 hr. How far did she have to walk?
A. 4 mi B. 2 mi C. 1 mi D. 18 mi
Factor completely. If a polynomial is prime, then state this as your answer.5x3 + x2y - 320x - 64y
A. (x - 8)(x + 8)(x + 5y) B. (x - 8)(x + 8)(x - 5y) C. (x - 8)(x + 8)(5x - y) D. (x - 8)(x + 8)(5x + y)
Find the domain of the rational function.f(x) = 
A. {x|x ? -2} B. {x|x is any real number} C. {x|x ? -2, 2} D. {x|x ? -7}
Determine whether the study is an experiment or an observational study.A poll is conducted in which professional musicians are asked their ages.
A. experiment B. observational study