What is 5/12 minus 3/8 in simplest form

If sr is 4.5cm and tr is 3cm, what is the measure in degrees of angle s?

Girardo is using the model below to solve the equation . girardo uses the following steps: step 1 add 4 negative x-tiles to both sides step 2 add 1 negative unit tile to both sides step 3 the solution is which step could be adjusted so that gerardo's final step results in a positive x-value? in step 1, he should have added 4 positive x-tiles to both sides. in step 1, he should have added 3 negative x-tiles to both sides. in step 2, he should have added 4 negative unit tiles to both sides. in step 2, he should have added 1 positive unit tile to both sides.

Show your workcan a right triangle have this sides? *how to prove it without using the pythagorean theorema*