Use a ratio box to solve this problem. the ratio of new pens yo used pens in the box was 4 to 7. in all there were 242 new pens and used pens in the box. how many new pens were in the box?

Which is the equation of an ellipse with directrices at x = ±4 and foci at (2, 0) and (−2, 0)?

Aline has a slope of and a y-intercept of –2. what is the x-intercept of the line?

Sanya noticed that the temperature was falling at a steady rate of 1.4 degrees every hour from the time that she first checked her outdoor thermometer. by 6 a.m., the temperature had fallen 21 degrees. which expression can you use to find how many hours earlier she had first checked the thermometer?