please answer this also include an explanation i seriously have no idea what to do letters should have been never added to math im failing every class except ela

The verbal translation for the difference of m and 7 increased by 15

Tabby sells clothing at a retail store, and she earns a commission of 6.25% on all items she sells. last week she sold a pair of jeans for $32.50, a skirt for $18.95, and 2 blouses for $14.95 each. what was tabby's total commission? a $4.15 b $5.08 c $81.35 d $348.60

Bring the fraction a/a-4 to a denominator of 16-a^2