Write a system of equations associated with the augmented matrix. Do not try to solve.
A. 15x + 5y = 13
7x + 2y = 12
B. 5x + 15y = 13
2x + 7y = 12
C. 15x + 5y = 13
2x + 7y = 12
D. 15x + 5y = -13
2x + 7y = -12
Answer: C
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Solve.A rectangular box with volume 517 cubic feet is built with a square base and top. The cost is $1.50 per square foot for the top and the bottom and $2.00 per square foot for the sides. Let x represent the length of a side of the base in feet. Express the cost of the box as a function of x and then graph this function. From the graph find the value of x, to the nearest hundredth of a foot, which will minimize the cost of the box.
A. 8.79 feet B. 8.83 feet C. 8.91 feet D. 8.49 feet
Solve the equation. Write the answer in a + bi form.x2 - i = 0
A. -1, 1
B. -i, i
C. 
+ 
, - 
- 
D. 
- 
, - 
+ 
Multiply.(2x - 10)(x + 3)
A. 2x2 - 6x - 30 B. 2x2 - 30x - 4 C. 2x2 - 4x - 30 D. 2x2 - 4x - 4
Find the one-sided limit.
(x2 + 3x + 5)
A. 13 B. 5 C. 23 D. -5