Identify the open intervals where the function is changing as requested.Decreasing
A. (2, -1)
B. (1, 2)
C. (-1, 2)
D. (2, 1)
Answer: B
Mathematics
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Solve the equation after making an appropriate substitution.x4 - 50x2 + 49 = 0
A. {-49, 49} B. {-1, 1, -7, 7} C. {-50, 50} D. {-7, 7}
Mathematics
Graph the function.
A. 
B. 
C. 
D. 
Mathematics
If 
with A in QII, and 
with B in QIV, find
?
?
A. 
B. ?
C. ?
D. ?
E. ?
Mathematics
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
Mathematics