A soccer coach wanted to improve the team's playing ability, so he instructed the players to run two miles a day. At the same time the players decided to take vitamins without the coach's knowledge. In two weeks the team was playing noticeably better. Identify the confounding variable in this situation.

The sum of two numbers is 86, and their difference is 20. find the two numbers

If the ratio of sum of the first m and n terms of an ap is m2 : n2 , show that the ratio of its mth and nth terms is (2m − 1) : (2n − 1).

The graph and table shows the relationship between y, the number of words jean has typed for her essay and x, the number of minutes she has been typing on the computer. according to the line of best fit, about how many words will jean have typed when she completes 60 minutes of typing? 2,500 2,750 3,000 3,250