Can someone please explain what 15√16 is pleasee​

What is the missing step in this proof ?

What is the prime factorization of 230

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