Keisha spent 45 minutes at soccer practice on monday, and n minutes on tuesday. write an expression that represents the number of minutes she practiced soccer.

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