2x-3=y+1 equals to 2x4=y right?

Adam drew two same size rectangles and divided them into the same number of equal parts. he shaded 1/3 of one rectangle and 1/4 of the other rectangle. what is the least number of parts into which both rectangles could be divided into?

Given the two similar triangles, how do i find the missing length? if a=4, b=5, and b'=7.5 find a'

Aquadrilateral has exactly one pair of parallel sides. which name best describes the figure?