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Select all the correct answers. what is 221,000,000,000,000,000,000 expressed in scientific notation?

One card is dealt from a 52 card deck. find the probability that the dealt card is a 4 or a black 7

Aperpendicular bisector, cd is drawn through point con ab if the coordinates of point a are (-3, 2) and the coordinates of point b are (7,6), the x-intercept of cd is point lies on cd.