Will you me?
a square banner had 4 feet added its width and 2 feet subtracted from its height. the banner then had an area of 91 square feet. how long was a side of the original square banner?

Brian, chris, and damien took a math test that had 20 questions. the number of questions brian got right is 14 more than the number of questions chris got right. damien correctly answered 2 less than the number of questions chris answered correctly. if brian and damien have the same score, which statement is true?

Dylan and dusty plan to take weekly surfing lessons together. if the 2-hour lessons are $20 per person and they plan to spend $100 each on new surfboards, what is the maximum number of lessons the two can take if the total amount spent for lessons and surfboards is at most $480?

How much dextrose 70% must be mixed with dextrose 5% to prepare 1,000 ml of dextrose 20%?