What is the value of 4x- 7 when x=4?

What are the measures of ∠a, ∠b, ∠c and ∠d? explain how to find each of the angle measure.

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°?

Just tell me how to set up the equation.