Astudents cost for last semester at her community college was 2300 dollars. she spent 368 dollars of that on books. what percent of last semester college costs was spent on books

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