The answer: <span>13.634
Don't believe me? Check with a(n) calculator!</span>
A^2-5a = 6
a^2-5a-6 = 0
Discriminant = (-5)^2-4(1)(-6) = 49
Discriminant is positive so there are two solutions
According to the rule of 72, that rate will be 72/33 ≈ 2.18 percent.