In a survey it was determined that the demand equation for VCRs is given by
?
?
The demand equation for blank VCR tapes is given by
?
?
where p and q denote the unit prices, respectively, and x and y denote the number of VCRs and the number of blank VCR tapes demanded each week. Determine whether these two products are substitute, complementary, or neither.
?
A. complementary
B. neither
C. substitute
Answer: A
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A. 4 + 
i
B. - 
+ 4i
C. 
- 4i
D. -4 - 
i
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Find a polar equation for the conic. A focus is at the pole.e = 
; directrix is perpendicular to the polar axis 3 to the left of the pole
A. r = 
B. r = 
C. r = 
D. r = 