Determine whether each expression is equivalent to 10t^2+2t-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

You have 138.72 in your saving account u take out 45.23 and 18.00 you deposit 75.85 into your account

What is the ratio of the length of an object in yards to the length of the same object in miles?