Luna had $50 when she got to the carival after riding 12 rides she had $26 dollars left what was the price of each ride

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

Can someone me with #s 8, 9, and 11. with just one of the three also works. prove using only trig identities.

Prove that 16^4-2^13-4^5 is divisible by 11.