Answer:
r = - 8/9
Step-by-step explanation:

Answer:
1. 
2. <u>Given</u>
3.
4. <u>Side-Side-Side (SSS) rule of congruency</u>
Step-by-step explanation:
The two column proof is presented as follows;
Statement
Reason
1.
≅
Given
2.
≅
<u>Given</u>
3.
≅
Reflexive property
4. ΔRST ≅ ΔTUR
<u>SSS rule of congruency</u>
The Side-Side-Side rule of congruency states that if three sides of one triangle are congruent to three sides of another triangle then both triangles are congruent.
The answer is 6.5%, I just took a test with this question.