If this function is continuous, then the integral from 9 to 12 can be described as the sum of the following integrals:

9 to 10 equals 8

10 to 11 is unknown

11 to 12 equal 1

8 + 1 + unknown = 9

So the integral from 10 to 11 is zero.

For the second part, use the properties of integrals to write it as

9 INTEGRAL(f(x)) - INTEGRAL(8) with bounds as given.

Good luck!!