39. The mass of an empty lorry is 3.6tonnes. The
lorry was loaded with bogs of maize each
weighing 90kg. If the total mass of loaded lorry
is 10.Stonnes, what is the total number of bags
loaded?
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What is the inverse of the function f(x) = 2x + 1?

72 the length of a side of a triangle is 36. a line parallel to that side divides the triangle into two parts of equal area. find the length of the segment determined by the points of intersection between the line and the other two sides of the triangle.

Find the root(s) of f (x) = (x- 6)2(x + 2)2.