exam Maths Puzzle Numerical Ability

4) For the following function, C computes the cost in millions of dollars of implementing a city recycling project when x percent of the citizens participate. c(x)=1.4x/100-x

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Hello,

Can someone please help me with this question I am a bit confused with it.

Thank you,
Droxygirl1001

1) How are inverses used to solve linear systems? Explain in
Write the system of linear equations, use x,y,z and if necessary w,x,y,z.
Once system is written, use back-substitution to find its solution:

|1 2 -1 0 | 2|
|0 1 1 -2 | -3|
|0 0 1 -1 | -2|
|0 0 0 1 | 3|
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