Dominic has a $60 gift card to starbucks. Each time he buys a drink, it costs him $4.50. Which equation describes the relationship between n, the number of drinks Dominic buys, and A, the amount in dollars remaining on his gift card?

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