As part of a statistics project, a 6th grade teacher brings to class a container with 300 red marbles and 500 white marbles which are thoroughly mixed. To figure out how many marbles in the container are red without actually counting them all, a student randomly draws 40 marbles from the container. Of the 40 marbles drawn, 16 are red.The sampling proportion is
A. 37
%.
B. 5%.
C. 
%
D. 
%.
E. none of these
Answer: B
Mathematics
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A. 160.3 B. 160.254 C. 160 D. 160.25
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Decide whether the equation is or is not an identity.tan 
= -cot ?
A. Not an identity B. Identity
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Find the least common denominator.
, 
A. r(r + 1)(r + 7) B. (r + 7)2 C. r(r + 7) D. r(r + 7)2
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Evaluate the expression using the given value of the variables.-2x2 + 5y2 for x = 2, y = 3
A. 41 B. -53 C. 37 D. 7
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