T= number of minutes
Multiply 5 liters by number of minutes (t), then add the 17 liters already in the tank. This totals 72 liters or more.
17 + 5t ≥ 72
subtract 17 from both sides
5t ≥ 55
divide both sides by 5
t ≥ 11 minutes
ANSWER: Laura could add water for 11 minutes to be sure the tank has 72 liters or more.
Hope this helps! :)
4 + y = 19
y = 19 - 4
y = 15
Lorenas backpack is has the mass of 10000 grams so in kilograms the mass of Lorenas backpack in kilograms would simply be 10 kilograms