Help pls

Describe the possible echelon forms of the standard matrix for a linear transformation t where t: set of real numbers is onto.

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?

Solve for x -2.3(r - 1.2 ) = -9.66 enter you answer as decimal.