PLEASEEE HELP AND SHOW WORK

An arc subtends a central angle measuring 7pi/4 radians what fraction of the circumference is this arc?

2. explain in words how you plot the point (4, −2) in a rectangular coordinate system.

Prism m and pyramid n have the same base area and the same height. cylinder p and prism q have the same height and the same base perimeter. cone z has the same base area as cylinder y, but its height is three times the height of cylinder y. the figures and have the same volume.