-12
Working together, +10 and -2 can do that.
The factor pairs of 30 are (30,1)(15,2)(10,3)(6,5) None of them add up to 20.
multiplied to seventy and add to nine is impossible, but add up to 9 and multiplied to -70, or add up to -9 and multiplied to 70 are possible. In that case, 14 and -5 would do it (or -14 and 5)
2 and 252 multiplied together equals 504. I wouldn't say that they "multiplied add up to", however, because it could be confusing whether you are talking about multiplication or addition.
The correct answer is 5 + sqrt(5) and 5 - sqrt(5) which are approx equal to 2.763932 and 7.236068
6 and -2
-16 and 9
-134
28 x 10
-377
The interior angles add up to (20-2)*180 = 18*180 = 3240 degrees.The interior angles add up to (20-2)*180 = 18*180 = 3240 degrees.The interior angles add up to (20-2)*180 = 18*180 = 3240 degrees.The interior angles add up to (20-2)*180 = 18*180 = 3240 degrees.
20 + 19 = 39The two consecutive numbers that add up to 39 are 19 and 20.
The factor pairs of 12 are (12, 1) (6, 2) (4, 3) None of them add up to 5.