Aboard is 7 feet 9 inches long. how long is it in inches?

The product of two negative rational numbers is always zero sometimes zero never zero

The train station clock runs too fast and gains 5 minutes every 10 days. how many minutes and seconds will it have gained at the end of 9 days?

On a string instrument, the length of a string varies inversely as the frequency of its vibrations. an 11-inch string has a frequency of 400 cylces per second. find the frequency of a 10-icnch string.