Solve the system of equations. [Hint: Let u = 
and v = 
, and solve for u and v. Then let x = 
, and y = 
.]
A. x = 
, y = - 
; 
B. x = 
, y = -8; 
C. x = - 
, y = 
; 
D. x = -8, y = 
; 
Answer: B
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Determine by matrix multiplication whether or not A is the proper matrix of solution values.
A = 
A. Yes B. No
Write the rational expression in lowest terms.
A. c + n B. -1 C. c - n D. Already in lowest terms
Solve.Tickets to a ballet cost $16 if bought in advance. If bought on the date of the ballet, they cost $22. For the ballet to make a profit, the total money collected from ticket sales must be at least $380. Write an inequality to represent this situation, using x for the number of tickets bought in advance and y for the number of tickets bought on the date of the ballet. Do not solve the inequality.
A. 16x - 22y ? 380 B. 16x + 22y ? 380 C. 16x + 22y ? 380 D. 16x - 22y ? 380
Convert as indicated.25 tons to pounds
A. 25,000 lb B. 50,000 lb C. 400 lb D. 5000 lb