Haskell/Solutions/Variables and functions
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Exercises 


quadruple x = double (double x) quadruple 5 = double (double 5) quadruple 5 = double 10 quadruple 5 = 20
subtractHalf x = (half x)  12
Exercises 


volumeBox w h d = w * h * d
One approach for the Giza problem is starting from the pyramid volume and the estimated stone volume. Using general functions for the task, that might look like this in GHCi:
Prelude> let volumeBox w h d = w * h * d  Just as above. Prelude> let volumeSquarePyramid b h = b * b * h / 3 Prelude> volumeSquarePyramid 230.4 146.5 / volumeBox 1 1 1 2592276.48
Exercises 


volumeCylinder r h = h * area r