In a study of 6- to 11-year-old elementary school children, researchers find a strong positive association between reading level and weight. Heavier children have higher reading levels. Which variables could be potential confounding variables that explain the association observed between heavier weights and higher reading levels

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step-by-step explanation:

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the answer would be  

a.

3: 1

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.

(1 km=1000m, 1m=100 cm)