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by counting and calculating
There are lots of applications of calculus; for example: calculating maxima and minima, analyzing the shape of curves, calculating acceleration when you know the velocity, calculating velocity when you know the acceleration; calculating the area of figures; calculating the volume of 3D shapes; etc.
We use 9.81 N/kg as a mean value becuase if we don't, the decimal points will b huge.
You don't use a ream size for linerboard. The weight is per 1000 square feet of board. EI 42# liner weights 42#s per MSF (thousand square feet).
Nobody ever has because the true value of pi has never been worked out and we only use an approximation of pi when calculating the area of a circle.