If 552015000 cigarettes are smoked in a day, and the average cigarette is smoked in two minutes, how many cigarettes are smoked in two minutes in america?

In a school 2/3 of the students study a language of those who study a language 2/5 study french

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.

Ariel is working at a meat packing plant for 5 nights a week. her regular wage is $11 an hour. she earns tine and a half for any overtime hours. this week she worked 9 hours of over time .how much will ariel earn for overtime this week ?