A social networking website surveys its member to find out their opinion on privacy policies. They send an email to all memben hoping that a large number will read. Classify the sample.
Stratified
b. Self-Selected
Systematic
d. Convenience

What exactly is your question?

It's like discovering the answer to a puzzle. the purpose in solving an equation is to find the value or values of the variable that makes it a true statement. any value of the variable that makes the equation true is called a solution to the equation.