please help me i need to submit my math test on 10:00am please help me i really really need help please

What percent of the circle below is shaded?

How does a low unemployment rate affect a nation's economy? a. the nation has a higher number of productive resources. b. the nation can spend more money on for unemployed people. c. the nation can save money by paying lower salaries to a large workforce. reset

How many sides does a regular polygon have if each exterior angle measure is 45 degrees explain your answer, i really don't understand this.