For problems 7 to 9: The relationship between the diameter of a circle, d, and the circumference, C, is a direct variation. Given a circle of diameter 20 cm, the circumference is 62.8 cm. Write an equation that describes this relationship.
A. 
B. 
C. 
D. none of these
Answer: A
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Solve the system of equations by use of determinants. 5x - 4y - z = 4 x - 4y + 8z = 14 4x + y + z = 11
A. x = 2, y = -1, z = -2 B. x = 3, y = -1, z = 2 C. x = 1, y = 2, z = 1 D. x = 2, y = 1, z = 2
List the like terms of the expression.7x - 5x + 2
A. 7x, - 5x, and 2 are like terms B. 7x and - 5x are like terms C. There are no like terms D. 7x and 2 are like terms
Graph the ellipse and label the center.
+ 
= 1
A. C(4, 5)
B. C(-4, -5)
C. C(-4, 5)
D. C(4, -5)
A waste water system is being installed in a small town.The large pipes required to reach from the town to the water treatment plant come in 20-foot and 24-foot lengths. The city planner finds that twelve fewer of the 24-foot pipes will be required than if the 20-foot pipes were used. What is the distance from the town to the water treatment plant?
What will be an ideal response?