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

Mathematics

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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.

Mathematics

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

Mathematics

Find the weighted mean. Round to the nearest tenth.

A. 26.3 B. 27.4 C. 2.5 D. 28.3

Mathematics

Solve using the addition principle.-  + y = - 

A.
B.
C.
D.

Mathematics