Which of the following choices describe the conversion ratio you would use to convert feet to yards? check all that apply.

a. yards in the denominator
b. feet in the numerator
c. yards in the numerator
d. feet in the denominator

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