Does a plane has a definite beginning and ending

The table shows the balance of a money market account over time. write a function that represents the balance y (in dollars) after t years.

Find the values of y: 3y^3(y^2+ 2/3y)=0

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? )