One year, the population of a city was 99,000. Several years later it was 82,170. Find the percent decrease.

Me because some of question i don’t understand

Sara can take no more than 22 pounds of luggage on a trip.her suitcase weighs 112 ounces.how many more pounds can she pack without going over the limit?

The value of the expression 16-^3/4 8 1/8 -6 6 1/40 1/64