90 cookies will be needed for 30 students
The ratio would be 3:1
2 dozen= 24 so the ratio would be 24:8 but both numbers are divisible by 8
No because it cleans your skin.
First multiply x - 8 by 5:

Now you have to leave the linear term (5x) in one side and the constant terms (-40, 26, -29) in the other:

Divide -15 by 5 and you will get the value of x

The value of x = -3