Expressions and Equations

Which of the following is an equation?

• $4x=4$

• $3x-2$

• $5x$

• $10$

In the expression  $3x^2-4x$ , the variable is _____.

• 3

• x

• -4

• 2

In the expression  $3x^2-4x$ , the exponent is _____.

• 3

• x

• -4

• 2

In the expression  $5x-2$ , the coefficient is _____. 

• 5

• x

• -2

There are _____ terms in the expression  $4x^2-2x-1$  .

• one

• two

• three

• four

There are _____ terms in the expression  $9x-1$  .

• one

• two

• three

• four

In the expression  $6x+5y-7$ , the constant is _____. 

• 6

• x

• y

• 5

• -7

Solve the equation for x:
 $x-5=8$  

• x=13

• x=3

• x=12

• x=2

Solve the equation for x:

 $-3x=21$  

• 7

• -7

• 18

• -18

Solve the equation for x:

 $2+x=10$  

• 12

• -8

• 8

• -12