To solve this compound inequality, solve 2 < 2n + 20. You should get -9 < n (n > -9)
Then solve the right side of the compound inequality 2n + 20 <= 4. You should be n<= -8
When you graph this on the number line, you put an open dot on the -9 and a closed dot on the -8 and connect the two points with a line. That mean n is greater than -9 and less than or equal to -8.
Divide the number of gallons that leak out in 1 hour by 1 for example, say 5 gallons leak in 1 hour divide 1 hour or 60 minutes by 5 60/5=12 minutes so in this situation, 1 gallon leaks out every 12 minutes