Please solve this for me

Curious carl calculated the density of a cube to be 4.50 g/cm3. what is the density of the cube in g/l?

An engineer designs a roller coaster so that a car travels horizontally for 152 ft, then climbs 137 ft at an angle of 34.0° above the horizontal. it then moves 137 ft at an angle of 48.0° below the horizontal. if we take the initial horizontal motion of the car to be along the +x-axis, what is the car's displacement? (give the magnitude of your answer, in ft, to at least four significant figures and give the direction of your answer in degrees counterclockwise from the +x-axis.)

Which of the following is not a part of the respiratory system? a. pharynx b. trachea c. pancreas d. larynx