Find the cross-product and determine whether the proportion is true or false.
= 
A. 8 ? 162; false
B. 72 = 72; true
C. 18 ? 72; false
D. 36 = 36; true
Answer: D
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?Joe changes his socks twice a day. He has 54 socks, all of the same design and color in his sock drawer. If he uses all the socks in his drawer, will he have perfect enough socks for a given number of day? ?
A. ?yes, 2 divides 54. B. yes, 4 socks a day over 13 days uses up all the socks. C. ?no, 4 does not divide 54, since he needs 4 socks every day. D. ?yes, 2 divides 54, since he needs two pairs of socks a day. E. ?no, 4 does not divide 54, and he will need socks for 13 days. He will run out before then.
Find the polar coordinates of the point(s) of intersection of the given curves for 
r = 1 - cos 
, r = 1 + sin 
A. 
B. 
C. 
D. 
Graph the function by starting with the graph of the basic function and then using the techniques of shifting, compressing, stretching, and/or reflecting.f(x) = 
A. 
B. 
C. 
D. 
Solve the problem.The rational function C(x) = 
, 0 ? x < 100describes the cost, C, in millions of dollars, to inoculate x% of the population against a particular strain of the flu. Determine the difference in cost between inoculating 80% of the population and inoculating 50% of the population. (Round to the nearest tenth, if necessary.)
A. $405.0 million B. $404.9 million C. $1.1 million D. $1.0 million