Is this equivalent can you explain

No it is not equivalent.

Step-by-step explanation:

5h + 2h² = 7h?

5h + 2h² = 9h

Because in the equation 5h + 2h² = 7h the 2h² was not calculated yet.

  or  

step-by-step explanation:

if the four friends split the cost, p, of the pizza evenly, then each friend pays one-fourth of the cost of the pizza.

the expression is   or  

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