There are two with the same remainder when divided by 17

What is the missing constant term in the perfect square that starts with x^2 -20x

Me with this one question, and i'll upvote the brainliest answer

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