P(t) = 600,000(1.05)t, with P(t) representing population and t representing years after 2010. The formula is exponential. f(t) = 700,000 + 10,000t, with f(t) representing the food supply in terms of number of people supplied with food and t representing the number of years after 2010. The equation is linear.
The population exceeds the food supply sometime during 2015.
Yes; the food supply would run out during the year 2031.
Yes; the food supply would run out in the year 2034.
Closing...
Why did the equation f(t) = 600,000(1.05)t increase so much more quickly than the equation f(t) = 700,000 + 10,000t?
The first formula is exponential while the second formula is linear.
One of the studying population growth involves estimating food shortages. Why might we be interested in modeling population growth at a local level?
City planners may use population models to plan for road construction, school district boundaries, seware and water facilities, and similar infrastructure issues.
Lesson 7: Exponential Decay S.45
Do Now:
12750 *0.15
127501912.50
Carry down previous
What number could I multiply the value of the car by to get the value of the car one year later?
0.85 What is the ratio between the value after 1 year and the start value? What is the ratio between the value after 2 years and the value after 1 year? Between year 3 and 2? Year 4 and 3? Year 5 and 4?
What does the value 0.85 have to do with a 15% decrease?
It is what is left after you take off 15%. You are left with 85% of the car's value.
S.45
Our equation looks quite similar to the formulas we used in the last two lessons for exponential growth. Is the value of the car growing?
How can I tell just by looking at the formula that the value of the car is not growing? The value of 0.85 shows you that the value is getting smaller each time. This is called exponential decay
What determines whether an explicit formula is modeling exponential decay or exponential growth? The value of the growth factor, b, determines whether an explicit formula is modeling expontial growth or exponential decay if b>1, the output will grow over time if b<1, the output will diminish over time
Because negative exponents give us fractional answers, a negative exponent with b >1 would also show decay.
eg. A formula like f(t) = 1000(2)t would model decay over time What happens to the output if the growth factor of the formula is 1? The output would neither grow or nor decay. The initial value would never change.
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