find the least common denominator for the following rational expressions.
18/r-4 5r/r^2-5r+4 r+7/r^2-4r-5
(r-1)(r-4)(r-5)
(r- 1)(r + 4)(r-5)
(r-1)(r + 1)(r – 4)(r-5)
(r- 1)(r+ 1)(r + 4)(r-5)

Three cylinders have a height of 8 cm. cylinder 1 has a radius of 1 cm. cylinder 2 has a radius of 2 cm. cylinder 3 has a radius of 3 cm. find the volume of each cylinder ( ! : ”0 )

Of the ones listed here, the factor that had the greatest impact on the eventual destruction of native americans' ways of life was the development of the a) automobile. b) highway. c) railroad. d) steamboat.

Over the last 8 nights, elyse earned the following in tips: {105, 120, 84, 95, 100, 132, 140}. if she earns $140 a night for the next four nights, which measure of center would increase more, the mean or median?