Grandma has $250,000 to invest. She divides her money into two accounts. One account is in untra-safe treasury bills paying 4% interest, and the other is in riskier corporate bonds paying 6%. If she needs $12,000 per year in income from her investments, how much should she invest in each account?

60%

a ≈ 172.05

step-by-step explanation:

the pictures.

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.