Type the missing number in this sequence:
16, 7, __, -11, -20

A20? -foot ladder is placed against a vertical wall of a? building, with the bottom of the ladder standing on level ground 19 feet from the base of the building. how high up the wall does the ladder? reach?

Which of the following answers is 5/25 simplified? 1/5 5/5 2/5 1/25

If g(x) is an odd function, which function must be an even function?