## Welcome to H3 Maths

Blog Support for Growing Mathematicians

## Posts tagged with one billion

### A billion trees? Let’s break that down to human levels

November24

In a recent news item a comment was made about reaching a tree-planting target of 1 billion – “With the right incentives and the right conditions, one person could comfortably plant 400,000 trees in a year. So you would need just 250 people planting that amount every year for a decade (10 years) to reach […]

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### Having fun in a knowledge economy!

March23

“The NCAA men’s basketball tournament began last Thursday.  It is estimated that more than 60 million Americans have completed tournament brackets predicting the winners and losers.  Across the country, employees are spending workday time monitoring games, and discussing predictions and results with colleagues.  Many are waging bets. According to one estimate, the cost of lost wages […]

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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)?]