Fifty percent of students enrolled in an astronomy class have previously taken physics. Thirty percent of these students received an A for the astronomy class, whereas twenty percent of the other students received an A for astronomy.Find the probability that a student selected at random received an A in the astronomy course.
A. 0.50
B. 0.10
C. 0.45
D. 0.25
E. none of these
Answer: D
Mathematics
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Find a formula for the nth term of the sequence.1, - 
, 
, - 
, 
(reciprocals of squares with alternating signs)
A. an = 
B. an = 
C. an = 
D. an = 
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Solve the problem.Find the image of the given figure under the translation that takes P to P'.
A. 
B. 
C. 
D. 
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For each set described, write the set in roster form.{x|x is a natural number between 14 and 19}
A. {14, 15, 16, 17, 18} B. {15, 16, 17, 18, 19} C. {15, 16, 17, 18} D. {14, 15, 16, 17, 18, 19}
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Rewrite the expression as the sum and/or difference of logarithms, without using exponents. Simplify if possible.log2
A. 
log2m + 
log2n - 
log2k
B. 5 log2m + 9 log2n - 2 log2k
C. 
log2m + 
log2n - 2 log2k
D. 
log2m ? 
log2n ÷ 2 log2k
Mathematics