Junior high classes of 20 students each met in the cafeteria to take achievement tests. If exactly 7 students sat at each table and 20 tables were used, how many classes took the tests?

good job you smart son of a gun you are smarter that einstein. 7

step-by-step explanation:

first, eliminate the parenthesis:

3

x

+

2

−

4

x

second, group like terms:

3

x

−

4

x

+

2

third, combine like terms:

(

3

−

4

)

x

+

2

→

−

1

x

+

2

→

−

x

+

2

1) is right

step-by-step explanation:

well what did you do it matters what you did : )

step-by-step explanation: