I need help! If you answer I will mark!

What is the frequency of the sinusoidal graph?

In a class, there are 12 girls. if the ratio of boys to girls is 5: 4 how many boys are there in the class

If the endpoints of the diameter of a circle are (8, 6) and (2,0), what is the standard form equation of the circle? a) (x + 5)2 + (y + 3)2 = 18 (x + 5)2 + (y + 3)2 = 3.72 (x - 5)2 + (y - 3)2 = 18 d) (x - 5)2 + (y - 3)2 = 32