What is the most useful standard bulb method for determining distances to galaxies?

Aquantity of gas has a volume of 1.5 m3 and an absolute pressure of 95 kpa. when the gas is compressed to a volume of 0.5 m3, what is the new absolute pressure of the gas? (assume that there’s no change in temperature.)

Could someone me find the answer to this problem.

Acar drives toward the right over the top of a hill, as shown below. which arrow represents the centripetal acceleration? w x y z