I need help ASAP! I’m not good with math

Suppose the radius of a circle is 16. what issuppose the radius of a circle is 16. what is its circumference its circumference

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

Pat listed all the numbers that have 15 as a multiple write the numbers in pats list