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A cell phone company charges $35
per month plus $0.03 per minute. If
Jack's September cell phone bill is
$99.50, how many minutes did he talk
in September? Write and solve an
equation.

Carmen and matt are conducting different chemistry experiments in school. in both experiments, each student starts with an initial amount of water in a flask. they combine two chemicals which react to produce more water. carmen's experiment starts with 30 milliliters of water in a flask, and the water increases in volume by 8.5 milliliters per second. matt's experiment starts with 10 milliliters of water and increases in volume by 28% each second.