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Start by drawing a sketch of the graph of $f(x)$ for $a\leq x \leq b$.
What is represented by $bf(b) - af(a)$?
Which parts of the graph correspond to the integrals?
Area L
Age 16 to 18
Challenge Level 
Start by drawing a sketch of the graph of $f(x)$ for $a\leq x \leq b$.
What is represented by $bf(b) - af(a)$?
Which parts of the graph correspond to the integrals?
