Help plz I don't wanna fail my diagnostic I already have full on C's I only have 1 week left I really need to go to the next grade :)​

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?

What is the size of the matrix resulting from

What are the solutions to the equation 4x2+3x=24-x