Fill in the blank with one of the words or phrases listed below. 
A letter used to represent a number is called a(n) 
.
A. constant
B. solution
C. numerical coefficient
D. variable
Answer: D
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Write the expression with only positive exponents and evaluate if possible. Assume all variables represent nonzero real numbers.-x-4
A. 4x
B. - 
C. 
D. -4x
Combine. Simplify the answer.
+ 
+ 
A. 3
B. 
C. 
D. 4
Solve the problem.
A radio telescope has a parabolic surface. If it is 1 m deep and 20 m wide, how far is the focus from the vertex?
A. 5 m B. 25 m C. 1 m D. 100 m
Solve using elimination.
A. x = 2, y = 3; x = 2, y = -3; x = -2, y = 3; x = -2, y = -3 or (2, 3), (2, -3), (-2, 3), (-2, -3) B. x= 1, y = 3; x = 1, y = -3; x = -1, y = 3; x = -1, y = -3 or (1, 3), (1, -3), (-2, 3), (-2, -3) C. x = 1, y = 3; x = -1, y= -3 or (1, 3), (-1, -3) D. x = 2, y = -3; x = -2, y = 3 or (2, -3), (-2, 3)