Select one answer for part a and one answer for part b

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

What is the anwers for 9+2x=5x-3-x

If cos(2x) = tan^2(y), show that cos(2y) = tan^2(x).