Please answer! I will give brainliest ! ;)

The area of a rectangle is 15+5y square feet. which of the following expressions could be the length of the sides of the rectangle, in feet a. 5 and 3y b. 5 and 3+y c. 5 and 5+y d. 3 and 5+3y

Sum is 17 and their difference is 3

Iwill give ! if m∠a=59 and m∠3=81°, what is m∠b? m∠b= _[blank]_°