A large glass and metal pyramid designed by I. M. Pei attracts visitors to the
entrance of the Louvre Museum in Paris, France. If
a plumb line from the highest point of the pyramid
to the center of the base is 71 ft long and each side
of the four equilateral triangles measures 100 ft, how
far is it from the center of the base to a corner of the
base?

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.

Determine whether the set of whole numbers is closed under addition. explain why the set is or is not closed. give an example.

The administrator of a large assisted living facility wanted to know the average age of the residents living at the facility. he randomly selected 12 residents and determined their age, listed here: 80, 65, 75, 83, 68, 73, 88, 79, 94, 72, 79, 68 what's the average age of the sample of residents? a. 79 years old b. 68 years old c. 75 years old d. 77 years old