Richard practiced each of 3 piano solos for 5/12 of an hour. how long did he practice in all?

The equation x2 – 1x – 90 = 0 has solutions {a, b}. what is a + b?

Which inequality comparing two of the expressions is true when 0.7 < x < 0.9

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