1. 12/18/2015 Perkins Honors Precalculus Day 7 Section 4.7

2. Exponential Growth or Decay Function y = Final Amount C = principal k = rate of growth/decay (%) t = time Half-life time needed for half of the original amount to remain Doubling-time time needed for the original amount to double (Uninhibited)

3. 1.The value of a certain piece of machinery depreciates at a rate of. Find its value 5 years after purchase. 2.A radioactive substance is decaying at a rate given by. Find its half-life.

4. Newton’s Law of Cooling u(t) = temp of object at time t T = temp of atmosphere u 0 = initial temp of object k = rate t = time 3. Pg 347 #14

5. Perkins Honors Precalculus Day 7 Section 4.7

6. Exponential Growth or Decay Function Half-life time needed for half of the original amount to remain Doubling-time time needed for the original amount to double

7. 1.The value of a certain piece of machinery depreciates at a rate of. Find its value 5 years after purchase. 2.A radioactive substance is decaying at a rate given by. Find its half-life.

8. Newton’s Law of Cooling 3. Pg 347 #14