So last week we reviewed and took two tests. Wednesday we took the first part of the test, which was the multiple choice part, and Thursday we took the free response part of the test. I completley failed the multiple choice portion of the test Wednesday. Thursday it felt like I did better. On number one I had no clue what I was doing because it was the one kind of problem I didn't know how to do. It was a problem with related rates, I think, and air planes. Supposedly the answer to the question was either 500 or -500. I ended up with 499.25? I have no clue how, but it's pretty close to the real answer. So on the multiple choice portion of the test, many people (including myself) did horribly on limits. I have no clue why I did horribly on limits because I know how to work them. I just blanked out. Anyway, because of our failure on limits, Mrs. Robinson gave us a packet that concentrated only on limits. She also gave us notes once again on how to find and figure out limits.
The steps she gave us are as follows:
1. if when plugged in, the denominatior of the limit equals zero
a. factor and cancel
b. plug into your calculator
Many people do not know how to use their calculator to find a limit, so I'll give the steps
1. plug limit into y=
2. second table
3. plug numbers to the left and right of what x is approaching
Ex: lim x->0(sin^8x/x^8)
You would first plug this limit into y=, then you would hit second table. Once you get into your table, you plug in values to the left and right of zero (-.1, -.01, -.001, .001, .01, .1). When these values are plugged in, both sides give you 0.9. This shows you that the limit x->0(sin^8/x^8) approaches 1.
I still don't know how to do angle of elevation problems or problems with air planes.
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Ok, for angle of elevations, you have to find all you sides of the triangle using trig functions (i always use cos for some reason). then you find the angles with m = tan(theta). the ones with airplanes you just multiply the mph times sin of the angle
ReplyDeletefind the sides of the triangle by using trig functions then find angles using m=tan(theta).then multiply the speed of the plane by the sin of the angle.
ReplyDeleteangle of elevation: you mainly use the things like SOHCAHTOA u would use tan(theta)=opossite/adjacent. you just use the sides to find the angle
ReplyDeleteJessie and Ryan, do you two use different trig functions or just mainly stick with one like Malerie? And does it really make a huge difference?
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