4. nico joven presently earns $348.40 per week. he claims
himself and his mother as allowances. he is single. he is to get
a new job classification, which will result in a 15% increase in
pay. he also plans to marry. after his marriage, he will claim
his wife, himself, and his mother as allowances. how much
less will be withheld weekly for federal income tax?

12. the amount of money in a bank account decreased by 21.5% over the last year. if the amount of money at the beginning of the year is represented by ‘n', write 3 equivalent expressions to represent the amount of money in the bank account after the decrease?

Set $r$ is a set of rectangles such that (1) only the grid points shown here are used as vertices, (2) all sides are vertical or horizontal and (3) no two rectangles in the set are congruent. if $r$ contains the maximum possible number of rectangles given these conditions, what fraction of the rectangles in set $r$ are squares? express your answer as a common fraction.

Factor the polynomial by its greatest common monomial factor.