7 x 2.7 = 18.9 + 4.2 = 23.1
The numbers are: 42+ 7 times sq rt of 30 and 42- 7 times sq rt of 30
7
Yes.
245
49
The sum of 7 plus 7 plus 7 plus 7 plus 7 plus 7 plus 7 is 49. This can be calculated by adding each number together: 7 + 7 = 14, 14 + 7 = 21, 21 + 7 = 28, 28 + 7 = 35, 35 + 7 = 42, and finally 42 + 7 = 49.
6/7 + 1/6 = 36/42 + 7/42 = 43/42 = 11/42
-x2 + x + 42 = -[x2 - x - 42] = -[x2 - 7x + 6x - 42] = -[x*(x - 7) + 6*(x - 7)] = -(x - 7)*(x + 6)
No - 27 can be divided by 3 & 9. 42 can be divided by 2, 3, 6 & 7
(5+7-42)(24-2+3) = (12-42)(22+3) = (-30)(25) = -750
3/7 + 1/6 = 18/42 + 7/42 = 25/42
23/42 + 1/6 = 23/42 + 7/42 = 30/42 = 5/7