Find the exact value of cos A in simplest radical form.

Ineed to learn how to solve this problem

High schoolmathematics 5 points keith is the leading goal scorer for a team in an ice hockey league. last season, he scored 42 goals in 82 games. assuming he scores goals at a constant rate, what is the slope of the line that represents this relationship if the number of games is along the x-axis and the number of goals is along the y-axis?

Solve the equation by completing the square. x^2+2x=17