Suppose that the 8 identical faces of a regular octahedron, like the one shown below, are numbered from 11 through 18, with 1 number per face, and each face is equally likely to land down when the octahedron is tossed. What is the probability that, on 1 toss of this octahedron, the number on the face landing down is a prime number or an even number? x y z 2x 2y 3z 1 _ _ 3 1 _ _ 3 12 18 15 1 _ _ 8 1 _ _ 4 1 _ _ 2 7 _ _ 8 DO YOUR FIGURING HERE. 21 GO ON TO THE NEXT PAGE. ACT-E26 2 2 26. In nRST below, U is a point on RT ___ such that SU → is an angle bisector of ∠RST. What is m∠R ?
