book Maths Puzzle Numerical Ability

How do you work out the percentage increase/decrease between two figures?
Example. What is the percent increase/decrease from 41210 to 38853?

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book Other Question

How do you find the vertex and intercepts for

y = x^2 -6x

and how do you graph it?

Any help is appreciated! Subtract the complex numbers and simplify: 3+2i/1+2i-1/1/2i= Help! Thank you.