Soon after taking an aspirin, a patient has absorbed 280 mg of the drug. after 2 hours, only 70 mg remain. find an exponential model for the amount of aspirin in the bloodstream after t hours. hint [see example 2.]
f(t)=
use your model to find the amount of aspirin in the bloodstream after 4 hours.
f(t)= .

10 ! a train starts from grand city and travels toward belleville 388 miles away. at the same time, a train starts from belleville and runs at the rate of 47 miles per hour toward grand city. they pass each other 4 hours later. find the rate of the train from grand city.

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Acaterer charges $500 plus $30 per guest to cater a wedding. walt and traci don't want to spend more than $8000 on catering. write and solve an inequality in terms of the number of guests, g, that can be invited. a) 30g ? 8000; g ? 267 b) 500g < 8000; g < 16 c) 500 + 30g < 8000; g < 250 d) 500 + 30g ? 8000; g ? 250