Luke is decorating trees for an outdoor birthday party. There are 3 trees and Luke needs 4.25 yards of ribbon for each tree. If each yard of ribbon is $1.40, how much will it cost to buy enough ribbon to decorate all 3 trees?

Colby and jaquan are growing bacteria in an experiment in a laboratory. colby starts with 50 bacteria in his culture and the number of bacteria doubles every 2 hours. jaquan starts with 80 of a different type of bacteria that doubles every 3 hours. let x equal number of days. colbys experiment follows the model: a.) y=50*2^x b.) y=50*2^8x c.) y=50*2^12x jaquans experiment follows the model: a.)80*2^x b.)80*2^8x c.)80*2^12x