PLEASE HELP ME OUT HERE! 20 points, please!

What is a function that matches the description?
A Sinusoidal Function has a y-intercept at 4, midline y=4, and maximum value of 8 and completes 4 cycles of the interval [0,2π]

Let f(x) = 5/x and g(x)=2x2+5x. what two numbers are not in the domain of f o g

(01.03 mc) which of the following is a step in simplifying the expression x multiplied by y to the power of 2 over x to the power of negative 3 multiplied by y to the power of 3, the whole to the power of negative 4. select one: a. x to the power of negative 4 multiplied by y to the power of negative 2, the whole over x to the power of negative 7 multiplied by y to the power of negative 1. b. x to the power of negative 4 multiplied by y to the power of negative 8, the whole over x to the power of 12 multiplied by y to the power of negative 12. c. x to the power of negative 4 multiplied by y to the power of negative 8, the whole over x to the power of negative 3 multiplied by y to the power of 3. d. x to the power of negative 4 multiplied by y to the power of negative 2, the whole over x to the power of negative 3 multiplied by y to the power of 3.

Based on the diagrams, what is the value of x?