Anna is x years old and her sister, Jane, is y years younger. 1) what was the sum of their ages two years ago.
2)What will the sum of their age be in 3 years.

let's first notice, the center of the hyperbola is at the origin, since the focus points are equidistantly 3 units away from the origin, that also means that the distance "c" from the center to either focus is 3.

it should also be notable that, the traverse axis for this hyperbola is vertical, or namely over the y-axis and therefore, the positive fraction will be the one with y-variable.

the traverse "a" component or distance from the center to either vertex is not 2, is more than 2, so we can safely put it at √5 ≈ 2.24.

a≈380.13mi² would be your answer if the radius was 11 miles