You would first look at the tens place numbers; 10 and 30. and add them together making 40. after that you'd take the ones places and add them together; 7 and 8. add those together and you'd get 15. to finish you just need to add the two numbers together 40 and 15.
The pieces shown are like all of 8 slices of a pizza.
the area of cirlce = area of the rectangle formed by rearranging the pizza slices.
= (pi*r)*r
The answer is A hope this helps
16 - (-15) = 16 + 15 = 31...difference of 31 degrees
