Condense the logarithm

Which expression is equal to (f+g)(x)?

Plzzz answer both questions and i will give you 100 points

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?