Anyone know how to do this, I’m lost!

20 points for 3 given: ∆abc, ab = bc, m∠1< 90° perimeter of ∆abc = 25 difference between the two sides is 4 find: ab, bc, ac list the sides of δrst in in ascending order (shortest to longest) if: m∠r = 3x+42°, m∠s = 4x−11°, and m∠t = x+13° list the sides of δrst in in ascending order (shortest to longest) if: m∠r = 2x+11°, m∠s = 3x+23°, and m∠t = x+42°