What is the difference between usimg expanded form and using place value

Apositive number a or the same number a increased by 50% and then decreased by 50% of the result?

Me, prove a quadrilateral with vertices g(1,-1), h(5,1), i(4,3) and j(0,1) is a rectangle using the parallelogram method and a rectangle method.

Can someone me out here number 4 plz