When Zahra runs the 400 meter dash, her finishing times are normally distributed with a mean of 84 seconds and a standard deviation of 1.5 seconds. Using the empirical rule, what percentage of races will her finishing time be between 81 and 87 seconds?

A80-foot piece of siding is cut into three pieces so that the second piece is four times four times as long as the first piece and the third piece is five times as long as the first piece. if x represents the length of the first piece, find the lengths of all three pieces.

25 ! the line of best fit is h = 5a + 86. predict the height at age 16.

In the triangles, bc =de and ac fe.if the mzc is greater than the mze, then ab isdfelth