Lindsay is 5 years younger than Mark. Seven years ago, the sum of their ages was I. Let l be Lindsay's age and let m be Mark's age.

The perimeter of a movie screen is 54 meters. the screen is 18 meters wide. how tall is it?

How can the correlation in the scatter plot graph below best be described? positive correlation negative correlation both positive and negative no correlation

Asap! i'm not good math and i'm lost.