Can someone answer these 4 questions?

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

Which fraction is equal to 1hole and 2/5? a.3/5 b.75 c.57 d.73

Find the missing dimension! need asap! tiny square is a =3025 in ²