Subject social studies please help me on this 2 questions

Paige is a shy 15 year old who tries to avoid social encounters as much as possible. compared with her outgoing, socially confident friend krista, who is also 15, paige is

How and why has british society changed over the last 50 years?

24-karat gold is considered to be pure gold. 18-karat gold is considered to be about 75% gold. what is 18-karat gold considered a mixture rather than a pure substance? a) it has a variable composition of other elements and minerals. b) its color is different than pure gold. c) the gold atoms are not arranged in a repeating pattern. d) it can be melted and transformed into a different substance.