The vertex form of the equation of a parabola is y=2 (x+4)^2-21. what is the standard form of the equation?

Which ahows the graph of the solution set of 6x+4y< 12

One integer is 8 times another. if the product is 72, then find the integers

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