A person is sitting in a roller coaster. The person has a mass of 65 kg and the chair has a mass of 90 kg. What is the center of mass of the person/chair system if the center of mass of the chair is 0.4 m from the ground and the center of mass of the person is .7 m from the ground?

magnified images possible images can be real = projected onto a screen

the total distance traveled by the car is

30km + 49km = 79 km .

the old price per ounce is c/4.

the new price per ounce is c/3.6.

the ratio of the old price to the new one is

(c/4)/(c/3.6) = (c/c)×(3.6/4) = 0.9 . . = 9/10 . . "nine tenths" in either form