## Welcome to H3 Maths

Blog Support for Growing Mathematicians

## Posts tagged with what’s the better deal?

### The Magic of Number 9 and Coffee!

September10

Does this number 9 seem to be smiling at you? Well perhaps it is! At least it doesn’t look sad and there is a smile in the middle after all. “In eight studies published from 1987 to 2004, prices ending in the magic number nine (\$1.99, 49 and so on) boosted sales by 24 per […]

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#### Post Support

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)?]