Could someone me. i have answers put in but i got them wrong.

The diameter of a circular chip is doubled to use in a new board game. the area of the new chip will be

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

Erin bought christmas cards for $2 each to send to her family and friends. which variable is the dependent variable?