HELP ME PLZ I NEED THE FORMULA AND AN EXPLANATION TO THE ANSWERRR

Answer:
[tex]r1 + r2 = r3[/tex]
Step-by-step explanation:
ℎ ℎ ℎ ℎ ℎ
Answer:
This is your answer ☺️. If I'm right so,
Please mark me as brainliest. thanks!!!