What is the answer for x?

The circumference of a circle is 5 pi cm. what is the area of the circle?

What is the result of the following division?

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? )