What is negative 1 plus positive 8

Which of the following is the missing term, a2, of the geometric sequence in which a1=2 and a3=200

What is the distance between the points (2 -3) and (-6 4) on the coordinate plane

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