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Posts tagged with equator

Math goes around the world

February13

The Circumference Problem: Let’s assume that the earth is circular. We put a rope around the equator but then decide that it is best to be one metre off the ground. How much more rope will we need? The answer is in the Post Support!

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The Train Problem

November23

Two identical trains are traveling around the equator – one from west to east and one from east to west. Which train is the heavier?

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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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