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IGCSE MATHS Doubts

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Adzel:
this one please..

PeaceMaker:

--- Quote from: Adzel on May 11, 2010, 03:29:44 pm ---this one please..

--- End quote ---

I would love to know part (a) these questions always come and i always get confuse by them so, anyone care to explain?

Vin:
Q 20)

once u kno the area beneath 8-10 which is 19.4

A (trapezium) = 1/2 * ( sum of parallel sides ) * h

so 19.4 = 1/2 ( x + 12.4 ) * 2

19.4 = x + 12.4

x = 19.4 - 12.4

x= 7
  

Adzel:

--- Quote from: PeaceMaker on May 11, 2010, 03:32:45 pm ---I would love to know part (a) these questions always come and i always get confuse by them so, anyone care to explain?

--- End quote ---

Easy...just find the upper bound and the lower bound, as it said to the nearest km i.e. 1/2 = 0.5

So, 22 - 0.5 = 21.5 (lower bound)
     22 + 0.5 = 22.5 (upper bound)

    i.e. 21.5 < d < 22.5

....but im only concerned about part (b)

Malak:

--- Quote from: Adzel on May 11, 2010, 03:38:51 pm ---Easy...just find the upper bound and the lower bound, as it said to the nearest km i.e. 1/2 = 0.5

So, 22 - 0.5 = 21.5 (lower bound)
     22 + 0.5 = 22.5 (upper bound)

    i.e. 21.5 < d < 22.5

....but im only concerned about part (b)

--- End quote ---

Its least amount...so just multiply ur lower bound with 5 to get the distance for 5 days n thn multiply with the amount of money...

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