book Maths Puzzle Numerical Ability

Let f(x) = �5x � 3 and g(x) = x2 + 10x. Find (f o g)(x)

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book Other Question

What is x in a line that contains the point (2,6) and (x,15), with a slope of 3? car travels 57 mph. how many miles does car travel in 3 hours and 40 mins.
how do you convert 40 mins?