What is the lower quartile of the data

Find the difference (8ab+a+2) - (3ab+6)

Find the solution of this system of equation -7x+y=-20 9x-3y=36

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