Write a matrix equation equivalent to the system of equations. 10w + 3x - 2y - z = -10 4x + 8y = -3-8w - 5x - y - 3z = 4 w - 10x + 4z = 8
A. 
= 
B. 
= 
C. 
= 
D. 
= 
Answer: C
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Use the theoretical probability formula to solve the problem. Express the probability as a fraction reduced to lowest terms.A fair coin is tossed two times in succession. The set of equally likely outcomes is {HH, HT, TH, TT}. Find the probability of getting the same outcome on each toss.
A. 
B. 
C. 1
D. 
Solve the problem.The number of traffic accidents has been decreasing in a certain county each year. The data is shown in the table for several recent years. The set of data can be approximated with a linear equation.
Find an equation of the line.
A. y = -78x + 625 B. y = -78x + 615 C. y = 78x + 625 D. y = -88x + 625
Find the weighted mean. Round to the nearest tenth.
A. 26.3 B. 27.4 C. 2.5 D. 28.3
Solve using the addition principle.- 
+ y = - 
A. 
B. 
C. 
D. 