Assume that the matrix a is row equivalent to b without calculations, list rank a and dimnul a. then find bases for col a. row a, and nul a 10-15 b= 0 -2 5-6 7 0 0 0 0 - were can save me

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

i think the correct option is the second option.