The cost of 1 lb of triamcinolone 0.1% cream is $171.00. what would be the cost of 15 grams?

The first thing you should know to solve this problem is the following conversion:
 1 lb = 453.592 grams
 Therefore, we can make the following rule of three:
 453.592 grams > 171 $
 15 grams > x
 Clearing x we have:
 x = (15 / 453.592) * (171)
 x = $ 5,655
 
 the cost of 15 grams is:
 x = $ 5,655

A regular star is equilateral and has congruent angles at the vertices and congruent angles at each indentation. 
Equilateral means all sides are equal. The star is equiangular too since it has the same measure of angles. 

The number of lines of symmetry of the said regular star can be explained through the reflection symmetry, also known as Mirror symmetry whereby the star's half is the reflection of the other half of the same star.