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Posts tagged with aviation

Mathematicians take notice

June11

The Notices is the world’s most widely read magazine aimed at professional mathematicians. Notices provides opportunities for mathematicians and students of mathematics to find out what is going on in the field. Each issue contains one or two such expository articles that describe current developments in mathematical research, written by professional mathematicians. The Notices also […]

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Graphing altitude, speed and time

April5

Aircraft have to fly the most efficient way in order to maximise profits for the airline. The take-off, cruising altitude and speed, and descent are all carefully calculated mathematically. There are many complex factors at work in flight dynamics. This example shows three related flight parameters (which we looked up as it was a flight […]

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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)?]