We are asked to sum the two trinomials

. We can start by using the distributive property to remove the parenthesis, giving us

. Next, when we combine like terms, we get

. Hope this helped!
All you need to know is that domain is x and range is y, like a graph.
Answer:
4-lower- 18
5-upper-29
6- range-56
Step-by-step explanation:
If you look up a completed box plot you can tell where lower and upper quartiles are. Range is found by Max-Min
Hope I helped...!
It is 9.25 gallons, I hope this helps :)