Two cups of coffee A college student consumed two cups of coffee, each containing 80 mg of caffeine, 90 minutes apart. Suppose that just before he consumed his second cup of coffee, 65 mg of caffeine was still in his system from the first cup of coffee. How much caffeine remains in his system 7 hours after he drank his first cup of coffee?

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Q: Forty grams of a certain radioactive material disintegrates to 16 grams in 220 years. How much of…

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Q: AN OUTDOOR HOT DOG VENDOR SELLS AN AVERAGE OF 60  HOT DOGS PER DAY IN DRY WEATHER AND AN AVERAGE OF…

A: The outdoor hot dog vendor sells an average of 60 hot dogs per day in dry weather and an average of…

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A: We solve the problem by just constructing the equation and solving them.

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A: Given query is to find the number ofeach type ball.

Q: a population of bacteria originates with 2500 bacteria. After a harmful substance is introduced into…

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A: Consider the following:

Q: hours, 4 inches of snow has fallen. If it continues to snow at the same rate,how many inches of snow

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Q: You work for a social media company. In 2016 your platform had 1.5 million users. In 2019 your…

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Q: ave a can that holds 16 cups of water and it is filled a quarter full I water11 plants so each plant…

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A: Given : For every pound of flour a baker adds 2.2 oz. of additives. there is 15% of additive A, 25%…

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Q: At the beginning of a basketball season, the Panthers won 20 games out of 91 games. At this rate,…

A: The Panthers won 20 games out of 91 games.

Q: A certain pollutant has a concentration of 120 part per million (ppm)  in large tank. A filtration…

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