What is the sum or difference of 1/2 + 1/4, 3/5 - 2/15, 2/3 - 1/4, 1/6 + 4/5, 3/4 - 1/2, 11/15 + 3/10, 7/10 + 2/3, 7/8 - 9/16 and the simplest form of them!

11. a particular type of cell doubles in number every hour. which function can be used to find the number of cells present at the end of h hours if there are initially 4 of these cells? a. n = 4 ()" b. n = 4(2)" c. n = 4 + (2)" din = 4 +"

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

Math it's appreciated. (picture provided)