100+80, 99+81, 98+82....
To solve this one, subtract 50 from 180 and you'll have your answer.
5x+32+7x+8=180. By the laws of commutativity we can thus say that 12x+40=180. Subtracting 40 we get 12x=140. Divide by 12 and you get x=(do it yourself) This has nothing to do with calculus by the way.
It is: 126 plus 54 = 180
a + 3a + 5a = 180 9a =180 a = 20
It is: 97+83 = 180
It is: 157+23 = 180
It is 90+90 = 180
It is 134+46 = 180
180+72=252
87794 + 39357 + 180 + 439 = 127,770
180