Write the fractions in order from least to greatest 1/4 3/6 1/8

How do you find principle and simple interest

Ineed in figuring out this problem.

Find the equation of the ellipse with the following properties. the ellipse with foci at (0, 6) and (0, -6); y-intercepts (0, 8) and (0, -8).edit: the answer is x^2 over 28 + y^2 over 64 = 1