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 previously took a physics course and did not receive an A in the astronomy course.
A. 0.35
B. 0.40
C. 0.15
D. 0.10
E. none of these
Answer: A
Mathematics
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Find the length of the curve.x = 
t2, y = 
(2t + 1) 3/2, 0 ? t ? 1
A. 2
B. 3
C. 1
D. 
Mathematics
Give a verbal representation for the given function. f(x) = 4x2. Let y = f(x).
A. To obtain y: Add 4 to x, then square the result. B. To obtain y: Multiply x by 4, then square the result. C. To obtain y: Square x, then multiply the result by 4. D. To obtain y: Square x, then add 4 to the result.
Mathematics
Solve the problem.Find the perimeter.
A. 23x + 5 cm B. 20x + 9 cm C. 19x + 5 cm D. 23x + 2 cm
Mathematics
Solve the problem.Joe has traveled 
of his total trip. If the trip is a total of 640 miles, how many miles has he gone?
A. 102
miles
B. 128 miles
C. 512 miles
D. 256 miles
Mathematics