Expand this expression and combine like terms 1/3(x-9)

When you are making a circle graph by hand, how do you convert a number for a part into its corresponding angle measure in the circle graph? when you are making a circle graph by hand, what should you do if one of your angle measures is greater than 180°?

The tile along the edge of a triangular community pool needs to be replaced? ?

In the equation sqrt(n+5)-sqrt(11-10)=1. what is the value of n