Use the points A(-1, -4) and B(9,10) to answer the following questions. 1. Find the midpoint of AB . Label coordinate A as 1 1 ( , ) x y . 2. Find the midpoint of AB . Label coordinate B as 1 1 ( , ) x y .

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