Find the value of a.

Can someone answer this question? : )

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

Graph the line that represents a proportional relationship between d and t with the property that an increase of 33 units in t corresponds to an increase of 44 units in d. what is the unit rate of change of dd with respect to t? (that is, a change of 11 unit in t will correspond to a change of how many units in d? )