Billions hope I helped please hit that thank you button!
The mixed number would be 4 1/3, this is because of the 5 trays of brownies, 4 entire ones were sold which means only a fraction of the 5 one was sold. (4 out of 12) 4/12 could be simplified by dividing the top and bottom with 4 which leaves us with 4 1/3
The angle is sin inverse 0.3535 which is around 21 degrees
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D. 25% as there are 8 sections and two wanted outcomes this can be simplified into a 1/4 so 1/4=25%