What is the answer to this..√25x+10=15

Tell whether the two rates form a proportion

Aclothing designer is selecting models to walk the runway for her fashion show. the clothes she designed require each model’s height to be no more than y inches from 5 feet 10 inches, or 70 inches. which graph could be used to determine the possible variance levels that would result in an acceptable height, x?

Pls what is the relative minimum of the function? enter your answer in the box