Simple interest is I = P(1 + r)^t, where P is principle and r is rate and I is interest and t is time. Here the rate is .05, principle is 15000 and t is 2.
Not A because regular means all sides are equal. B has to be the answer because the others are not. Not C because a right triangle is not regular, i.e. and equilateral triangle. Not D because a rectangle has different side lengths.
