9. A survey of television viewers at A Child's Place Preschool produces the following data:
60% watch Sesame Street.
50% watch Captain Kangaroo.
50% watch Polka Dot Door.
30% watch Sesame Street and Captain Kangaroo.
20% watch Captain Kangaroo and Polka Dot Door.
30% watch Sesame Street and Polka Dot Door.
10% watch all three shows.
(a) What percentage view at least one of these programs?

a_n = a_1 + (n - 1)d

the first term is 6.

the common difference d = ?

when you find d, replace n with 7 and d with the common difference to find your answer.

i'm not really sure how to answer that

step-by-step explanation:

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.