Write the first four terms of the sequence defined by each of the following recursive formulas. Q1 = 3 and an = Qn-1-3

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

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

What is the radius of a circle with an area of 78.5 cubic inches? use 3.14 for pie