Does anyone know the answers to this? Please correctly answer

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

Which inequality statement describes the two numbers on a number line? "? 7 and a number 5 units to the right of ? 7"

The equation of a parabola is given. y=18x2+4x+20 what are the coordinates of the focus of the parabola?