3 Select all the equations that the number 7 will make true. (1 Point) 4+? = 4 ? : 14 = 12 1:7 = ? 3:? = 1 3 9:-? = 63 4​

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?