a. it would be 105° because the 75° and this angle make a linear pair which adds up to 180°.
b. this is 105° because the two angles are alternate interior which are congruent
c. this is 75°, it is given.
The answer is the 64 square inches.
The answer to 8+11 is 19 because 8+1 is 9 so 11+8 is 19