Scribe Post 8.12.09

We started off with reviewing our Quiz from last class, and our Homework from last class. Then we took a Quiz regarding Log's. Our Quiz lasted for most of the class, but then we moved on to the next chapter.

We started off on pg.265, with problem #26 concerning the half-lives of Radon, and graphing the function y=ae^(-bt), where t is the length of time, b is the horizontal dilation, a is the vertical dilation, and y is the final value of the Radon. We subbed in values as t=1599, y=50, a=100, and then calculated for b, which was b=ln(1/2)/-1599. We then reversed our process, and calculated a with the values of 1.5=ae^-1000[ln(1/2)/-1599], which gave us the value of a=2.3g. We then filled in the values on TI-SmartView, which graphed the equation as a decaying function.

We then confirmed that the function did match the graph. Our homework deals with these functions tonight, but we don't have to memorize the functions for a test.

Next times scribe is Molly.