How do you write an inequality?

30 pts, will mark brainliestwhat is the period of the sinusoidal function? (picture 1)what is the minimum of the sinusoidal function? (picture2)what is the maximum of the sinusoidal function? (picture 3)

What is the sum of these mixed numbers 2 1/8 + 4 3/8

Anyone know? will mark brainliest if you're correct!