You charge customers $18.75 for lube service, parts, and labor. assuming you take one hour's labor at $15, and the parts cost $3.50, what is the tax rate on the parts? to the nearest tenth ? %.

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

step-by-step explanation:

what grade level is this? need to know so i can look in my old textbooks!