The is a measure of how spread out numbers are. it is the square root of the variance, and the variance is the average of the squared differences from the mean.

You are at a restaurant and owe $38 for your meal. you want to leave a 20% tip. how much will your tip be?

What is the value of x in the this question ?

Amira is painting a rectangular banner 2 1/4 yards wide. the banner will have a blue background. amira has enough paint to cover 1 1/2 square yards of the wall. the school colors are blue and yellow, so amira wants to add yellow rectangles on the left and right sides of the blue rectangle. the yellow rectangles will each be 3/4 yards wide and the same height as the blue rectangle. what will be the total area of the two yellow rectangles?