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b = 40 - a, c = 42 - a so b + c = 40 - a + 42 - a, ie 82 -2a = 34 so a = 48/2 ie 24 b = 40 - 24 ie 16 and c = 42 - 24 ie 18
4m - 37 = -28 ie 4m = -28 + 37 ie 4m = 9 so m = 2.25
n is the number of sides and interior angles are 162 deg so 90(2n - 4)/n = 162 ie (180n - 360)/n = 162 ie 162n = 180n - 360 ie 18n = 360 so n = 20.
5 is in the "tens" place so its value is 5 tens, ie 50.
Side is cube root of 125 ie 5 so suface area is 6 x 5 x 5 ie 150 squinches