exam Maths Puzzle Numerical Ability

Find the greatest value of each function. y=4x-2x squared

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exam Other Question

If the perimeter of a rectangle is 20 ft and the width is 6ft, find its length.[hint the perimeter of a rectangle is given by P=2L+2W.] We are to use interval notation for the solution set, I am still confused with this. Can you help?
2<2x+4<10

Here is another
3x-6=-3(2-x)

thankyou, lackinmathe