Cynthia bought 8 pens and pencils from the store on Sunday for $25.74. The pen cost $5.85 and pencil cost $2.34. How many
pens and how many pencils did she buy?

The resulting pressure of the air in the cylinder is 4 atmosphere.

Step-by-step explanation:

Given : If a tire pump whose cylinder has a volume of 2.0 liters at 1 atmosphere of pressure  compresses the air to a volume of 0.50 liters without releasing any of the air.

To find : What is  the resulting pressure of the air in the cylinder?

Solution :

Let and represent the pressure and volume of the gas at an initial state .

and represent the pressure and volume of the gas at an final state .

According to Boyle's Law,

Substitute,

Therefore, the resulting pressure of the air in the cylinder is 4 atmosphere.