Is a biased sample valid

Simplify (a/b - b/a) times (a - a^2/a+b) a - a^2/a=b is a mixed number

In a young single person's monthly budget, $150 is spent on food, $175 is spent on housing, and $175 is spend on other items. suppose you drew a circle graph to represent this information, what percent of the graph represents housing?

Sum of the interior angles of a pentagon