Whats equivelent to 9a + 12

5,600 x 10^3 = a) 560 b) 5,000,600 c) 5,600,000 d) 56,000

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

Solve 3x-18=2y and 5x-6y=6 by elimination show work