Exponential Decay

Write the rate of decay of the function as a percent.  $y=12\left(.9\right)^t$  

Write the rate of decay of the function as a percent.  $y=50\left(0.65\right)^t$  

Write the rate of decay of the function as a percent.  $y=2\left(\frac{7}{8}\right)^t$  

A city currently has 5040 students in its elementary schools. The number of students is expected to decrease by 2% annually for the next 20 years. Predict the number of students in 20 years. Round to the nearest whole number.

Match the exponential function with its graph.  $y=7\left(.4\right)^t$  

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Tags

CCSS.HSF-IF.C.7E

Match the exponential function with its graph.  $y=3\left(1.5\right)^t$  

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Match the exponential function with its graph.  $y=8\left(\frac{5}{6}\right)^t$  

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You would like to purchase a new car for $34,000. The car loses 15% of its value every year. Write an exponential decay function that represents the value of the car y (in dollars) after t years. What is the approximate value of the car after 5 years? Round to the nearest dollar.

You have 700 free text messages available each month according to your cell phone contract. You use 10% of your available text messages every day. Write an exponential decay function showing the number of text messages available each day. How many text messages are available after 15 days?

An adult takes 400mg of ibuprofen. Each hour, the amount of ibuprofen in the person's system decreases by 29%. How much ibuprofen is left after 6 hours? Round to the nearest whole number