What is the range for this set of data? 21 42 48 59 63 67

If the value of cos330°is√3/2 then find cos 165°.

Can someone explain to me how to do

He letter p on the number line below represents the number . (use the hyphen for negative numbers and write answer as a decimal, such as –7.2) number line from negative 7 to positive 7 in increments of 0.5 is shown. only the whole numbers are labeled. a point labeled p is placed at the eleventh tick mark to the left of 0.