Considering that the expression 5a + 5a + 5ab + 5ab is equivalent to 10a + 10ab, what is an equivalent expression for 6abc + 6abc + 6abc? a) 18abc b) 18a + 18b + 18c c) 18a + 18ab + 18abc d) 216a + 216b + 216c

For a short time after a wave is created by wind , the height of the wave can be modeled using y= a sin 2pi(t) / t where a is the amplitude and t is the period of the wave in seconds. how many times over the first 5 seconds does the graph predict the wave to be 2 feet high?