Evaluate the expression for the given value of the variable 7a - 4a for a =8

24

Step-by-step explanation: you simply substitute 8 for a.

7(8)=56 - 4(8)=32

56-32=24

it will cost dollar $540

the living room is 3 which means if we divide 325/3 then we get $108

therefore if 1part of the living room cost $108 and 3 costed $325

then total 5part of the room will cost 5*108 which gives $540