Seven years from now the age (a) of jose will be which expression matches this situation? a) 7a
b) a - 7
c) a + 7
d) 7 - a

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