Find the probability pf at least 6 failures in 7 trials pf a bionomial expieriment in which the probability of success in any one trial is 9%

What is the missing reason in the proof? segment addition congruent segments theorem transitive property of equality subtraction property of equality?

Alex took his brother to a birthday party. the party was scheduled to last for 1 and 3/4 hours but they stayed for 4/5 of an hour more. how long did she stay at the party?

Cd is the perpendicular bisector of both xy and st, and cy=20. find xy.