Hello sjara . Do you agree?

So we want three rectangles, each of width units, starting at , ending at ; total width

The mid-point of the first rectangle, then, is at . So this is the first value of to plug into the function; i.e.This is the height of the first rectangle, then. Its area is therefore .

The next value of is at the mid-point of the second rectangle; i.e. at ; and the final value will be at .

Work out and , and then the total area.

I make the answer . Do you?

Grandad