4a) The length of WY is congruent to the length of WX so set them equal and solve for n.
5n - 2 = 2n + 7; add 2 to both sides
5n = 2n + 9; subtract 2n from both sides
3n = 9; divide both sides by 3
n = 3; substitute 3 in for the value of n
2(3) + 7 = WY
6 + 7 = WY
13 = WY
4b) First find the value of KN by using the pythagorean theorem (a² + b² = c²) so the value of KN is 17² = 14² + KN² or √19
Then you can use that value to find the value of NL using pythagorean theorem again. 17² = √19² + NL² or √270.
To find OL, divide √270 by 2 to get approximately 8.22
Hope this helps!!
***I actually just realized that the measure of NL is 14 and 1/2 of 14 is 7 so 7 is probably more accurate***