Please help I need u I have a picture to explain

Mustafa contributes 11% of his $67,200 annual salary to his 401k plan. what is his pretax income

Aboat costs 19200 and decreases in value by 12% per year. how much will it cost in 5 years

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