because when you add 1 to 0 it is 2
2*-2= -4 2-2= 0
0
1 plus negative 1 equals 0. If you add a negative to something, it is bassically taking it away from the adding number. In other words, you can just change the + sign to a - sign. :)
520
520 can go into 7 0 times.
five five five five equals twenty
520 = (5 x 100) + (2 x 10) + (0 x 1)
The factor pairs of 54 add up to 15, 21, 29 and 55. None of them equal 0.
it is 121
50 mm. (To find out, you just add a 0.)
0.0404