Express 15.16 as a mixed number plz

The parabola y = x² - 4 opens: a.) up b.) down c.) right d.) left

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

There are 45 questions on your math exam. you answered 810 of them correctly. how many questions did you answer correctly?