Which statement best describes the relationship between the lengths of the sides of the triangle shown below?

A. r squared is equal to t squared minus s squared.
B. The square root of t is equal to r plus s.
C. s squared equals t squared plus r.
D. s plus t is equal to r squared.

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.