I need help it’s for a test??

Agas initially at p1 = 1 bar and occupying a volume of 0.5 liter is compressed within a piston–cylinder assembly to a final pressure p2 = 4 bar. (a) if the relationship between pressure and volume during the compression is pv = constant, determine the volume, in liters, at a pressure of 3 bar. (b) repeat for a linear pressure–volume relationship between the same end states. reference

Acompound machine is also called a machine. a. force b. simple c. complex d. directional

What is the average speed of a car that travels 40mph for 1 hour and 60 mph in another hour will mark brainliest