Arectangle has sides of length 16 kilometers and 4 kilometers. what is the perimeter?

Acar travels at an average speed of 52 miles per hour. how long does it take to travel 299 miles

Adozen bananas weigh 3 pounds how many ounces does 1 banana weigh

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.