Select the expression that will calculate how many eighths are in 2 bars?

a. 2 divide by 8
b. 8 divide by 2
c. 2 divided by one eighth
d. 8 divide by half

To calculate how many eighths are in 2 bars, we can use the following expression:

b. 8 divide by 2

This is because 1 bar is equal to 8 eighths, so we can divide the total number of eighths (which is 16) by the number of eighths in one bar (which is 8) to get the answer, which is 2.