1.What did you call a number or symbol that has a fixed value and does not change
A.constant
B.equation
C.expression
D.variable

2.Blank or unknown is represented by a letter which may take on different value.
A. constant
B.equation
C.expression
D. Variable
3.Which of the following is Not an equation?
A.x+y
B.4d-8=-2d
C.a+1=9
D. 2x=10
4.What is the variable in the expression
A. y
B. +
C.3
D. 1
5.what is the value of x in, x + 2 = 5 ?
A.2
B.3
C.4
D.5
6.find the value of a in this equation a - 1 = 9
A.7
B.8
C.9
D.10
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