Awedding planner needs to determine how many appetizers to order for between 300 and 330 guest . should she use exact answer, approximate, or an estimate

An angle that measures between 90 and 180° is called a(,

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 the ratio of sum of the first m and n terms of an ap is m2 : n2 , show that the ratio of its mth and nth terms is (2m − 1) : (2n − 1).