March 16 2010

We started class today by looking at the project. We're supposed to have worked for an hour on it, and just keep working on it. We talked about number 4 a little bit, Mr. O'Brien reminded us to make the scale on the y-axis correspond with the graph, so that the window shows the entire graph.

Next, we looked at the test, and started super-corrections. We specifically went over number 9. This was the question that said to let p=sin40º, and let q=cos110º. For these problems, its helpful to draw a diagram, and draw the angles and their supplements.

Since the y-coordinate of each of the black points is p, sin40º=sin140º, so for question a, the expression for sin140º, is p. I'm still a little fuzzy on this one, but I think there's a bunch of people in class who get it more.












We also talked about number 12 on the test, the question about phase shift. The question says to find the phase shift of the graph below, which looks like this:

For this problem, it was first necessary to find the equation, and then put it in the right form. Then you could plug in k and c into -c/k.

For the rest of class, we continued to work on supercorrections, and will next class too. The homework is to keep working on the project and the supercorrections.






Next Scribe: Marnie :)