Help me please ASAP help help

Find the value of the variable and the length of each secant segment.

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

The number of fish in a lake can be modeled by the exponential regression equation y=14.08 x 2.08^x where x represents the year