HELP ME! Explain how you could use the dimensions of a reduced rectangle and one given measurement of an original rectangle to find a missing measure?

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?

Maria walks a round trip of 0.75 mile to school every day.how many miles will she walk in 4.5 days

What is negative 3/9 times negative 2/8 ?