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 $1900 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 C = AB, find c11 . What does this entry of C represent?
A. c11 = 147,000. c11 represents the sales of System 2 at all stores in July.
B. c11 = 157,000. c11 represents the total sales at Store 1 in July.
C. c11 = 167,000. c11 represents the total sales at Store 3 in July.
D. c11 = 179,000. c11 represents the total sales at Store 1 in July.
Answer: B
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Write a differential formula that estimates the given change in volume or surface area.The change in the volume V = ?r2h of a right circular cylinder when the height changes from h0 to 
and the radius does not change
A. dV = 2?rh0 dh B. dV = ?r02 dr C. dV = ?r2h0 dh D. dV = ?r2 dh
Use Stokes' Theorem to calculate the circulation of the field F around the curve C in the indicated direction.F = x2i + xyj + yk; C: the counter-clockwise path around the perimeter of the rectangle in the x-y plane formed from the x-axis, y-axis , x = 3 and y = 6
A. 108 B. - 54 C. -108 D. 54
Write 
in the form 
when k = 5.
a. 
b. 
c. 
d. 
e. 
Solve the system of equations by substitution.
A. (7, 0) B. (0, -7) C. (1, -8) D. no solution