Which property can be used t show that 4r+3s+2r=6r+3s?

Farnesene is a sesquiterpene. how many different isomers arising from double-bond isomerizations are possible? g

Melanie is buying a bathing suit that costs 39.99. she is given a discount at the cash register of $6.00 when she scratched 15% off on a game piece for a store promotion. what will the sale price of melanie’s bathing suit be?

Ineed the solution to this problem and the steps.