9. A real estate agent uses a random sample to estimate the average family
size in the neighborhood. The circled
numbers represent the agent's random
sample.
Use the mean of the random sample to
estimate the average family size in the
entire neighborhood.

i would say true? if the unit was informational and it "refreshed your understanding", then true.

he has 140 chickens because he has 10 times more chickens than ducks and he has 14 ducks so 14*10=140

add 8+12 to get a simplified answer of 12r-20

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.