Definite integral

Question

Use this graph (not to scale):

and these facts:

1. the area of region A1A1 is 66
2. the area of region A2A2 is 33
3. the area of region A3A3 is 11
4. the area of region A4A4 is 11

to evaluate this definite integral:

∫1002⋅f(x) dx=∫0102⋅f(x) dx= 

Answer 1

Given: the area of region A1A1 is 66, what do you mean by A1A1? A1 is a region, is A1A1 = (A1)² ?

I don't understand what the terms 1002 and 0102 are. Are they just numbers, which would remove the leading 0 of 0102?

Just looking at the figure, 66 - 33 + 11 - 11 = 33 is the answer.