Testing should be conducted on fire hydrants periodically to ensure they are operable and to determine the flow rate of the hydrants.

What should be done in order to isolate the variable x on one side of an equation and the numbers on the other?

A) Carry out the opposite of the operation that appears on the same side of the equal sign as x. B) Cross multiply all the numbers on the same side of the equal sign as x. C) Divide by 100 the numbers located on the same side of the equal sign as x. D) Identify the common denominator of the numbers on the opposite side of the equal sign from x.

The heart sound produced by the closing of the aortic and pulmonary valves is:

A) S4. B) S2. C) S3. D) S1.