What is the highest common factor of 92, 46, and 23?

Really need on these. i have no idea what to do

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 suare root of 9x plus 7 plus the square rot of 2x equall to 7