Qualification > Math
IGCSE MATHS Doubts
haris94:
@adzel
lower bound=22-0.5 = 21.5km
1 day he walks 21.5km
5 days = 21.5*5 = 107.5km
1 km = $1.6
107.5km = 1.6*107.5 = $172
Adzel:
--- Quote from: ~VIN1094~ on May 11, 2010, 03:36:41 pm ---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
--- End quote ---
how did you get 19.4???
diva_sparkles:
--- Quote from: haris94 on May 11, 2010, 03:15:54 pm ---u r saying percentage decrease=old value-newvalue/oldvalue*100
the old value is 15.2978
so shouldnt it be
(15.9128-15.2978)/15.2978*100
the ms answer is the same as yours
but the formula disagrees with the answer
--- End quote ---
it shld be (15.9128-15.2978)/15.2978*100 cos it it says in 2006 it wz 15.9128 n in 2007 it wz 15.2978 so ms is rite!!! :)
Adzel:
Thanx haris94 and ang3l
haris94:
--- Quote from: Adzel on May 11, 2010, 03:44:49 pm ---how did you get 19.4???
--- End quote ---
total distance - distance in first 8s
so
100m-80.6
=19.4m
Navigation
[0] Message Index
[#] Next page
[*] Previous page
Go to full version