Write and algebraic expression for 3 less than the quotient of 20 and x

Gregory draws a scale drawing of his room. the scale that he uses is 1 cm : 4 ft. on his drawing, the room is 3 centimeters long. which equation can be used to find the actual length of gregory's room?

Write an equation for the function that includes the points (1,4/5) and (2,2/3)

Write the slope intercept equation for line ab.