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2 + 18 = 20

The sum of twenty and negative two is 18

2 + 18 = 20

18 is the sum of the digits in 3,627 .You see, (3 + 6 + 2 + 7) = 18 .

The quotient of 18 and 2 is 9 The sum of 22 and 9 is 31 31-9=22

-18

1 x 6 = 62 x 6 = 12The sum of 12 + 6 = 18

9(2 + 3)

It is 9*(2 + 3)

-2 + 15 + 5 The indicated sum is 18 .

2, 3, and 13 are all prime numbers and their sum is equal to 18.

The sum of the interior angles are (18-2)*180 = 2880 degrees

18 and -2

They are 18 and -2.

14 16 18

product

20 + 18 = 38

The sum of the interior angles of an n-gon is given by the formula (n-2)(180) where n is the number of sides of the polygon. Thus, the sum of the interior angles of an 18-gon is (18-2)(180) = 2880.

The sum of 16 and 18 is 34.

18 1+8=9 9x2=18

(18-2)*180 = 2880 degrees

The sum of the prime numbers 2, 5, and 11 is 18.

(2 x 9) + (3 x 9) = 5 x 9 = 45

2 + 5 + 11 = 18 2 + 3 + 13 = 18

2 and 9 2*9 = 18 2+9 = 11