Solve the problem.How many 7-symbol codes can be formed using 4 different symbols? Repeated symbols are allowed.
A. 840
B. 16,384
C. 35
D. 210
Answer: B
Mathematics
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Find 
.y = -cos-1 
A. - 
B. 
C. 
D. 
Mathematics
Find the center and the length of a radius of the circle.x2 + y2 - 2x - 6y + 1 = 0
A. (–1, –3), r = 3 B. (3, –1), r = 6 C. (1, 3), r = 6 D. (3, 1), r = 3 E. (1, 3), r = 3
Mathematics
Find the volume of the solid generated by revolving the region bounded by the given lines and curves about the 
. y = 2cos (?x), y = 2, x = -0.5, x = 0.5
A. 8?
B. 4?
C. 
?
D. 2?
Mathematics
For the pair of functions, find the indicated sum, difference, product, or quotient.h(x) = x - 7, g(x) = 
Find (hg)(-4).
A. does not exist
B. -11 - 
C. -11
D. 3
Mathematics