When the sum of 5 and three times a positive number is subtracted from the square of the number, 0 results. find the number.

The train station clock runs too fast and gains 5 minutes every 10 days. how many minutes and seconds will it have gained at the end of 9 days?

Which expression is not a polynomial?

You give a $4 tip for a meal that cost $22. approximately what percent of the bill was your tip?