Hiii!! I need help with these questions thank you so much!

The circumference of a circle is 5 pi cm. what is the area of the circle?

What is the point-slope equation of a line with slope -5 that contains the point (6,3)

Use the four functions below for this question. compare and contrast these four functions using complete sentences focus on the slope and y- intercept first, and then on any additional properties of each function