I need help on how to complete the pattern to find the answer for each pattern. please someone help me?

How can we find the measure of an exterior angle if we know the measurement of an interior angle

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

What is the axis of symmetry of the function f(x)=-(x+ 9)(x-21)