Two sides of a triangle have lengths 11 and 18. what must be true about the length of the third side?

Any is very appreciated! (picture is provided below)not sure how to do this at all won't lie

Sasha drank 8 bottles of water everyday for a week. how many bottles of water did she drink in total?

Campus rentals rents 2 and 3 bedrooms apartments for $700 ans $900 a month respectively. last month they had six vacant apartments and reported $4600 in lost rent. how many of each type of apartment were vacant?