Last week amy ran 31 miles more than ryan. amy ran 40 miles. how many miles did ryan run? i have to write an equation and solve it so explain how to do this, you!

The mean of a set of data is -3.82 and its standard deviation is 2.31. find the z score for a value of 3.99.

How many different triangles can be constructed with the angle measurements of 134° 10° and 36° ?

Turner's mom measured his room to see how long the wallpaper border needed to be. if two walls are 15 feet long and two walls are 12 feet long, how long should the strip of border be cut?