SOLUTION:

Question 310639:
Answer by PRMath(133) (Show Source): You can put this solution on YOUR website!
Evaluate the variable expression when .a=-1/4, b=7/8, and c=1/8
8a + (7b -c)

Just "plug" in the info you are given, like this:

a =
b =
c =

8a + (7b - c) (original equation)
8 + ( - ) (see where the fractions are substituted in for the variables?)
+ (If you multiply 8 times you will get and... If you multiply 7 times you will get )
(If you subtract: you get: )
(Reduce the fractions: and )
(if you take -2 + 6 you will get 4)

I hope this helps you. :-)