What's two thousand six hundred times twenty one ?

If x + 10 = 70, what is x? a. 40 b. 50 c. 60 d. 70 e. 80

What are the solutions to the equation 4x2+3x=24-x

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