A 20-foot ladder is used to scale a 16-foot wall. At what angle of elevation must the ladder be situated in order to reach the top of the wall? (round to the nearest tenth)

Which statements are true? see picture

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

Aof 12 , we to a of 4 to on a .of 4 be ?