A20-foot ladder is placed 12 feet from the wall. how high up the wall will the ladder reach?

Ineed with number 17 i don’t get it at alll

Me complete this proof! prove that a quadrilateral is a square. me with the steps for this proof.

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