How many nickels are in 3 rolls of nickels

1 roll of nickels has 40 nickles.

40 * 3 = 120

120 nickels in 3 rolls of nickels.

when [oh-] is 10-5  m, and [h3o+] is 10-9  m, the poh is 5 and ph is 9. again in both cases the sum of ph and poh is 14. however, the hydrogen ion concentration is not always going to be equal to exactly 1 x 10 raised to a negative number. for example, we skipped over the value of 2.0 x 10-7.

that tool would be a compass