What is (2y+14.6m+3.8)-(34.8m+15.6+2y)

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?

You are at a restaurant and owe $38 for your meal. you want to leave a 20% tip. how much will your tip be?

Olga bought a new skirt that cost $20. sales tax is 5%. how much did olga pay, including sales tax? 7.