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OpenStudy (anonymous):
an ellipse has foci (0,+-4) and vertices (0, +-5) what is the eccentricity of the ellipse
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OpenStudy (freckles):
isn't it just \[\frac{\sqrt{b^2-a^2}}{b}\] ?
OpenStudy (anonymous):
Ep/1+-esin(PhETA) use that formula
OpenStudy (anonymous):
a. 0.8 b. 0 c. 1 d. 1.25
OpenStudy (anonymous):
my choices
OpenStudy (freckles):
try the formula i gave above
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