Please help! this is due my today and i don't understand it

Plz ! what is the volume of this pyramid? with numbers of 30cm 14cm 18cm

This is the number of parts out of 100, the numerator of a fraction where the denominator is 100. submit

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