Theorem 2.1 yields that k-periodic compounding of a principal Fo at r per annum over a time span of 7 years consisting of x interest periods gives a future value, Fx = (1 + 7) * For where x is a nonnegative real number and 0 < < 1 for k=1,2,.... Does Fx increase or decrease as k increases indefinitely? Justify your answer.