Helllppp ill give 11 points first one to answer gets 5 star and ! (if anyone after that answers, ill delete it jsyk)

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.

If f(x)= sqrt4x+9+2, which inequality can be used to find the domain of f(x)?

Identify the type of observational study described. a statistical analyst obtains data about ankle injuries by examining a hospital's records from the past 3 years. cross-sectional retrospective prospective