Which expression to a+ (c+7)?

(a + c) + 7

hope this helps

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

47 - 90 = 43

43 - 180 = x

x = 137