self Maths Puzzle

The maximum possible value of (5x - 25x) over all real values of x is

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self Other Question

If 7 points X1, X2, ..., X7 are chosen on a straight line in that order (but not necessarily evenly spaced), and Y is an arbitrary point on the line and S is the sum of the distances YX1, YX2, ..., YX7, then S is minimized when the point Y is You have 128m of lumber and want to make a border around your swimming pool. You contemplate the following shapes for the pool. Which of these shapes can be enclosed by 128m of lumber?

In the figures below X= 41m, Y = 23m and all angles except those in the parallelogram are right angled.