-120 ÷ 15 = -8.
Hope this helps.
Left is plus right is negative -11-(-15)=4 so you know 4 to the left
2,070mg 86%
— = —
? mg 100%
Cross multiply (2,070 X 100) which equals 207,000
Then divide 207,000 by 86 which equals
2,406.976
Then you round so you get 2,407
The Answer is 2,407 milligrams
The answer would be D because 3h + 2 (water) has to be less than or equal to > 14