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Math tools – learn your calculator!

September1

H3 continues to be amazed how many students have a calculator but have not taken the trouble to learn how to use it, often for simple statistical questions. Ask yourself a couple of questions:

1. Have you a copy (real or downloaded) of the manual for your model of calculator?
– if not, then download it NOW! – search for “xxxx (name of calculator model) manual” in Google

2. Have you used your calculator manual?
– if not, then use some homework time (better still, ask the teacher to set aside a few homework or class sessions to allow you more time to work through your calculator manual).

There are also some excellent youtube and websites that will show you how to do specific functions on your calculator. Click on the image below to link to some excellent instructions for the Casio and Sharp calculator series. This site also includes some useful powerpoints for you to work through:
Learn Calc

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y(y-8) = 9 –> y.y – 8y – 9 =0
–> (y-9)(y+1) = 0, therefore y = 9 (can’t have a distance of – 1 for the other solution for y)
Using the top and bottom of the rectangle,
x = (y-8)(y+2) = (9-8)(9+2) = 11
but, the left side = (x-4) = 11-4 = 7, but rhs = y+? = 9+?, which is greater than the value of the opp. side??
[I think that the left had side was a mistake and should have read (x+4)?]

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