Calculus anyone know how to solve this?

Factor the monomial completely 42a3b3

Which number completes the inequality? 2/3 < _ < 7/9

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? )