If you mean $11 & 791 cents, then it would be $18 & 91 cents
It can't be 5gallons In 10 minutes because gallons is physical time not!
To add the probabilities, you would have to treat them like any other numbers. If they are decimals or percents, you can follow basic addition rules. If you are given the probabilities as fractions, make sure that you have common denominators when you add them.
X/(-9) = 16
x/(-9) x (-9) = 16(-9)
x = 16(-9)
x = - 144
hope this helps
