Please I need help with this

What properties allow transformation to be used as a problem solving tool

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

Which statement best describes how to determine whether f(x) = x squared- x +8 is an even function ?