If the area of the circle is 28 in^2,what is the area of the shaded sector with 90 degree angle?

The jurassic zoo charges $14 for each adult admission and $5 for each child. the total bill for 77 people from a school trip was $565. how many adults and how many children went to the zoo? i

To prove that def ~ gfh by the sss similarity theorem using the information provided in the diagram, it would be enough additional information to know that

Add the fractions, and simply the result to lowest terms. 2/3 + 2/7= ?