HELP ME !
Please!
Which of the following tables represents a function?

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

What values of x satisfy the inequality x^2-9x< 0? how is your answer shown on the graph?

James was playing a game with his friends. he won 35 points. then he lost 15, lost 40 and won 55. how did he come out