Solve this 2 step equation 3x-8=7

Which representation has a constant of variation of -2.5

How to use order of operation in 20 divide by 4 multiply 5 = 1

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