Please help me with segments, lines, and angles

Which expression is equivalent to (3^2)^-2 a.-81 b.-12 c.1/81 d.1/12

The speed of a falling object increases at a constant rate as time increases since the object was dropped. which graph could represent the relationship betweent time in seconds, and s, speed in meters per second? speed of a falling object object over time

The measure of angle 0 is 600 degrees