What is the rate of 5 pounds

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

F(x)=x/2-2 and g(x)=2x^2+x-3 find (f+g)(x)

Two times a number plus three times another number equals 4. three times the first number plus four times the other number is 7. find the numbers