If you know how to solve please help me ​

In the 30-60-90 triangle below side s has a length of and side r has a length

How to choose the sign of the radical in the denominator of the formula for the distance from a point to a line.

Marla bought a book for $12.95, a binder for $3.49, and a backpack for $44.99. the sales tax rate is 6%. find the amount of tax and the total she paid for these items