Add or subtract. Simplify your answer to lowest terms.
- 
A. r + 9
B. r - 81
C. 
D. r - 9
Answer: D
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Solve the problem using matrices.The figure below shows the intersection of three one-way streets. To keep traffic moving, the number of cars per minute entering an intersection must equal the number of cars leaving that intersection. Set up a system of equations that keeps traffic moving, and use Gaussian elimination to solve the system. If construction limits z to t cars per minute, how many cars per minute must pass through the other intersections to keep traffic moving?
A. t + 1 cars/min between I2 and I1; t + 4 cars/min between I1 and I3 B. t + 2 cars/min between I2 and I1; t - 3 cars/min between I1 and I3 C. t + 8 cars/min between I2 and I1; t + 3 cars/min between I1 and I3 D. t - 2 cars/min between I2 and I1; t + 1 cars/min between I1 and I3
Find the slope and y-intercept of the line.2x - 7y = 3
A. slope = 2; y-intercept = 3
B. slope = 
; y-intercept = 
C. slope = 
; y-intercept = 
D. slope = 
; y-intercept = - 
Use the trigonometric substitution to rewrite the algebraic expression as a trigonometric function of ?, where 
. Then find sin ? and cos ?.
A. 
B. ?
C. ?
D. ?
E. ?
List all the elements of B that belong to the given set.B = {14, 
, -18, 0, 
, 
, 0.96, -7?, 0.252525. . . }Rational numbers
A. 14, -18, 0, 
, 
, 0.96, -7?, 0.252525. . .
B. 14, -18, 0, 
, 0.96, 0.252525. . .
C. 14, -18, 0, 
, 
, 0.96, 0.252525. . .
D. 14, -18, 0, 
, 0.96