Please help mathematics 8th grade

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

The volume of a cube-shaped shipping container is 13,824 cubic inches. find the edge length of the shipping container.

Which of the following contains a variable?