Solve the problem.A computer manufacturer has three outlet stores that sell its four computer systems. The following table shows the numbers of systems sold by the three stores in July.
The prices of the systems are: $1200 for System 1, $1500 for System 2, $1600 for System 3, and $2200 for System 4. Write the information from the table as a 4 x 3 matrix B. Write a row matrix A for which the entries represent the prices for the systems. If 
find c12. What does this entry of C represent?
A. c12 = 176,000. c12 represents the total sales at Store 3 in July.
B. c12 = 156,000. c12 represents the sales of System 2 at all stores in July.
C. c12 = 188,000. c12 represents the total sales at Store 2 in July.
D. c12 = 166,000. c12 represents the total sales at Store 1 in July.
Answer: C
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Write the phrase as a mathematical expression. Use x as the variable.The sum of a number and 12
A. 12x
B. x - 12
C. 
D. x + 12
Provide an appropriate response.In November, Steve uses his credit cards to buy $30.00 of holiday gifts each week. After 8 weeks he begins saving $30.00 each week to pay his credit card bill. Write an absolute-value function to represent the amount Steve has saved since he started buying holiday gifts. (Hint: Let purchases on credit cards represent negative savings.)
What will be an ideal response?
(6, 2), (3, 7)
A. x = - 
y + 12
B. y = 
x + 12
C. x = 
y + 12
D. y = - 
x + 12
Solve the equation.
x + 1 = 
x - 4
A. 
B. 
C. 
D. 