Ursula counted out the gummy bears and found 30 to be red. 4/15 were green and 1/3 were yellow . how many are green?

Me d is also an option but i couldn't get it in the picture

What is the equivalent fraction for the following fraction using 5 as the multiplier? 1/2

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?