All of th following are ways to write 25% of n except

What is the logarithmic function modeled by the following table? x f(x) 9 2 27 3 81 4

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

Compute the standard deviation of the following set of data to the nearest whole number. 10, 10, 15, 20, 25