EXPONENTIAL GROWTH/DECAY‼️‼️ y= 12 x 4^x

1. what are the missing reasons in the proof 2. it's in the second picture and 3

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

The border line of the linear inequality 4x + 7y < 5 is dotted true or false?