Choose the appropriate response. Perpendicular lines 
.
A. have opposite slopes
B. have the same slope
C. have slopes that are negative reciprocals of each other
D. always intersect at a 45° angle
Answer: C
Mathematics
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Write as a percent.0.783
A. 0.0783% B. 78.3% C. 0.783% D. 783%
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Factor the four-term polynomial by grouping.2xy - 6x + 7y - 21
A. (2x + y)(7y - 3) B. (2x + 7y)(y - 3) C. (2x - 3)(y + 7) D. (2x + 7)(y - 3)
Mathematics
Find the slope of the line if it exists.
A. undefined slope B. 0 C. 4 D. -4
Mathematics
Solve the problem.The owner of a video store has determined that the cost C, in dollars, of operating the store is approximately given by 
where x is the number of videos rented daily. Find the lowest cost to the nearest dollar.
A. $878 B. $622 C. $238 D. $494
Mathematics