Does anyone know which one is wrong, and what the answer is?

Iwill make brain if you me correctly fill this out needs due today pls and send it back to me (click the link and you will get it)

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

Ineeeeed this is due tomorrow and i dont know the answer can you find all the exponents