HELP!! Which Platonic solid has four faces that are equilateral triangles?

A. Hexahedron

B. Dodecahedron

C. Tetrahedron

D. Icosahedron

The data set represents the ages of players in a chess club. 27, 34, 38, 16, 22, 45, 54, 60. what is the mean absolute deviation of the data set?

597008.439431 to the nearest thousand

Match each set of points with the quadratic function whose graph passes through those points