Abox contains 10 red ribbons and 12 blue ribbons. once a ribbon is picked, it is not replaced. what is the probability of choosing a red then a blue ribbon?

I belive the answer is 1.
This is because out of 22 ribbon there are 10 which are bue so the probability of blue ribbons is 10/22 and probability of red ribbon is 12/22. So your question was the probability of choosing a red ribbon then a blu ribbon. Because of the word "then" , this means it is simply asking you to add their probablity so after adding 10/22 with 12/22 your answer will come to 22/22 which is equal to 1.

Square Area = ( one side length)²

784 = (AB)²

AB = 28

circle radius = 14

pi = 3.142

semi circle parameter = pi × r

= 3.142 × 14 = 43.988

square parameter = 3 × 28 = 84

we dont calculate the 4th side.

parameter of the figure = 43.988+ 84= 127.988