When doing the laundry, you use 18 cups of detergent for every 12 gallons of water. Which of the following equations can be used to calculate c, the number of cups of detergent needed when using 16 gallons of water?

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