Can someone me with this and how to solve this.

Look at the following graph of the given equation. determine whether the equation is a function. explain why or why not.

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

The mean of 10 values is 19. if further 5 values areincluded the mean becomes 20. what is the meanthese five additional values? a) 10b) 15c) 11d) 22