21-28-36-45-55-66-74-87-101
1,000 if u add 55 and 45 u get 100 and the differance of 55 and 45 is 10 so multiply 100 and 10 to get 1,000
3555
765
87+42+78 = 207
1 + 55 + 345 + 87 + 98 = 586
55 + 45 = 100.
21-28-36-45-55-66-74-87-101
For this set of numbers, 45 87 61 73 55 78 69 80: σ=14.0204
45-5x = 5x+55 -5x-5x = 55-45 -10x = 10 x = -1
45.
4x + 55 = 9x + 10 55 = 5x + 10 45 = 5x x = 9
45 -87 = -42
348
XXXII+LV = LXXXVII (32+55 = 87)
Assuming that there is a "plus" after the second 58, the answer is - the associative property of addition.
simply do addition and your answer comes out to be 246