Can some please help me

Five infinity stones cost $16.80. what is the price per infinity stone ?

Which functions have a y-intercept that is greater than the y-intercept of the function g(x) = |x + 3| + 4? check three options. f(x) = –2 (x – 8)2 h(x) = –5 |x| + 10 j(x) = –4(x + 2)2 + 8

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?