seven years ago beths son was one third her age at the time. seven years from now he will be one half her age. how old is beth's son

What is the product? (x2+3y+7) [yy+1)

Which of the following expressions is equal to 2x^2+8

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