Ineed finding x when y equals 18 if y equals 9 when x equals 8

The price of a coat increased from $78 to $92. what is the price increase percentage?

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

Measure of angles 31 (x+4) (3x+9) me