Help me out pls it’s for a wuiz

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

Solve each quadratic equation by factoring and using the zero product property. x^2 + 18x = 9x

What is the interquartile range of this day at set?