- - = + 9-(-4)= 9+4 so minus minus becomes plus. and 13 is the answer.
37.5 km is equal to 15 cm
2(n - 1) + 4n = 2(3n - 1)
2n - 2 + 4n = 6n -2
6n - 2 = 6n - 2 (equal)
6n - 6n = 2 - 2
0 = 0
whatever value you put into the place of n, you'll get 0 = 0
If 9 is 1/3 of the problem, then 9 x 3
= 27 would be the answer
$95.00 minus $9.50 equals $85.50
