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 $1800 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 c13 . What does this entry of C represent?
A. c13 = 164,000. c13 represents the total sales at Store 3 in July.
B. c13 = 144,000. c13 represents the sales of System 3 at all stores in July.
C. c13 = 124,000. c13 represents the total sales at Store 3 in July.
D. c13 = 154,000. c13 represents the total sales at Store 1 in July.
Answer: C
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Find the potential function f for the field F.F = 
A. f(x, y, z) = 
B. f(x, y, z) = x24y9z15
C. f(x, y, z) = x8y3z5
D. f(x, y, z) = x8y3z5 + 3x8y2z5 + 5x8y3z4
Solve the problem.A circle with a radius r contains a triangle whose base passes through the center of the circle and whose height is r. Express the shaded area in terms of r and ? as a completely factored polynomial.
A. ?(r + 1)2 B. r2(? - 1) C. ?(r - 1)2 D. r2(? + 1)
Tell which set or sets the number belongs to: natural numbers, whole numbers, integers, rational numbers, irrational numbers, and real numbers.- 
A. rational, real B. integers, real C. irrational, real D. real
Find the foci and asymptotes of the hyperbola.
- 
= 1
A. (-9, 0), (9, 0); y = 
x, y = - 
x
B. (-15, 0), (15, 0); y = 
x, y = - 
x
C. (0, -9), (0, 9); y = 
x, y = - 
x
D. (0, -15), (0, 15); y = x, y = -
x