Help me, asap, please

Evaluate the expression for the given value of the variable 2×(c2-5) for c=4

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

At 6 1/2 cents per pound of string beans how much does 7 pounds cost