Christina can paint 420 square feet in 105 minutes. which unit rate describes the scenario?

a) 4 square feet per minute
b)1/4 square foot per minute
c)1 square foot per 4 minutes
d)1 square foot per 1/4 minute

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

How can you tell when x and y are not directly proportional?

What is the x-intercept and y-intercept of the equation 2x+1. 2o