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23-10-2018
Mathematics

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20 POINTS!!!

I need help urgently with the question in the picture below!

20 POINTS I need help urgently with the question in the picture below class=

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23-10-2018

let f(x)=ax+b
11a+b=23.55
12a+b=25.35

solve: a=1.8 b=3.75
so ..

f(x)=1.8x+3.75
if x=31 , f(x)=59.55

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