Square root of 9 times 7 divided by the product of 8 multiplied by 12 foot and cube root of 36 times the quotient of 12 and 6 inches???

Pls! does anybody know a shortcut for answering these types of questions in the future?

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

The standard deviation for a set of data is 5.5. the mean is 265. what is the margin of error?