Convert 3/8 to a decimal.

Julie goes to the sports store and spends $40.50 before tax. she buys a pair of shorts for $21.75 and 3 pairs of socks that each cost the same amount. how much does each pair of socks cost? $$

Pls the last one and it has to be like number 6

I'm a polygon i have no parallel lines i am formed 3 line segments i have one right angle two of my angles are angles what am i