Which of the following is not a composition of isometries:
a. reflection over x=2 then rotation 90 degrees clockwise about the origin
b. dilation with scale factor 1/2 then rotation 270 degrees clockwise about the origin
c. translation (x, y)-> (x-2,y+1) then reflection over the y-axis
d. reflection over the x-axis then reflection over the y-axis

Mariah is randomly choosing three books to read from the following: 5 mysteries, 7 biographies, and 8 science fiction novels. which of these statements are true? check all that apply. there are 20c3 possible ways to choose three books to read. there are 5c3 possible ways to choose three mysteries to read. there are 15c3 possible ways to choose three books that are not all mysteries. the probability that mariah will choose 3 mysteries can be expressed as . the probability that mariah will not choose all mysteries can be expressed as 1 −