Please help asap! Add using the number line. 1.4+(−0.8)

Select the location on the number line to plot the sum.

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