Which is not a mathematical sentence?
A. y + 4 = 20
B. 7-r212
C. 6m
D. 9 - 2 = 7

B. 7-r212

Step-by-step explanation:

The coefficient should be in front of the variable.

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

the factors of 24 are 1, 2, 3, 4, 6, 8, 12 and 24. hope this ! mark brainliest! you v much! : )