Can someone go answer my last math question and help me with the rest of my math work please

Find the quotient. 50a2 – 98b2 -5a +7b

If 1/√5+1/√5+1=p+q√r , find the values of p, q and r

Miss henderson wants to build a fence around a rectangular garden in her backyard in the scale drawing the perimeter of the garden is 14 in of the actual length of a b is 20 ft how many feet of fencing what you need