The scale factor is 2 because, if you take a look at the the two triangles, the one on the right has lengths of 7 and the one of the left has lengths of 14 if you multiply 7 by 2 it = 14 and if you divide 14 by 2 it = 7.
Given that the total area of the walkway and the pool is w²+17w+66, and the width w, will be found as follows: A=length×width A=w²+17w+66 to get the new width we need to factorize the above quadratic form A=w²+17w+66 =w²+11w+6w+66 =w(w+11)+6(w+11) =(w+11)(w+6) From the answer, the width=6 units, length=11 units