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Archive for July, 2009

Friday, July 31st

July28

Wow, we are having some problems posting new blogs today (must be an issue with the recent changes on this site). Homework for July 31st is Qu 4 and Qu 5 and Qu 6 page 243. Back to you soon with more information! If you are having problems solving simple equations then check the worked […]

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Comments on Trig

July26

Wow, we have just come to the end of the Trigonometry Section. Key thoughts were; Tri=3, so we are working with triangles – mainly right-angled triangles. Thanks to Pythagoras, we can solve right-angles triangles when just side measurements are given (hypotenuse squared = sum of the other two sides squared). Click here for a really […]

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Post Support

The graph on the left (Coronavirus) is for a time period of 30 days, while the one on the right (SARS) is for 8 months! Very poor graphical comparison and hardly relevant, unless it is attempting to downplay the seriousness of the coronavirus?

10 x 9 x 8 + (7 + 6) x 5 x 4 x (3 + 2) x 1 = 2020

NCEA Level 2 Algebra Problem. Using the information given, the shaded area = 9, that is:
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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