Qualification > Math

Math Heeelppp!!

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al noor:
Can any1 solve these problems for me as i want to check if my answrs are right ;)
Thanyou in advance :D

Tyserius:
Okay, will try to help solve it for you. :) Give me a while.

astarmathsandphysics:
bridge question a)50
b)250(500-250)800+60

These numbers seem incredible. For the next part I get a ridiculous percentage error.
Are you sure these questions are correct?

astarmathsandphysics:
It says y = x(500-x)800 + 50
should it say y = x(500-x)/800 + 50

astarmathsandphysics:
b)i)30
ii)400
iii)10 and 50
iv) presumably x-60 so loss =-60^2+50+50-500=-500
vi)-x(x-30)^2+400
max profit of 400 at x=30

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