19. Subtract: 5 - 3 1/3

A. 3 1/3
B. 2 1/3
C. 1 2/3
D. 2 2/3

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?

How do i do this? i don’t understand

Give all possible names for the line shown.calculation tip: lines can be written with either point first.