If $4,000.00 is invested in an account for 25 years. Find the value of the investment at the end of 25 years if the interest is:
(a) 6% simple interest:
(b) 6% compounded monthly:

A33 gram sample of a substance that's used to detect explosives has a k-value of 0.1473. n = noekt no = initial mass (at time t = 0) n = mass at time t k = a positive constant that depends on the substance itself and on the units used to measure time t = time, in days