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gigi246899
17.01.2020 •
Mathematics
an ellipse has foci f1(9, 0) and f2(11, 6), and the point (1, 6) is on the ellipse. identify the constant sum for the ellipse.
a 20
b 10
c 0
d 100
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Ответ:
Distance D1:
(D1)^2 = (9-1)^2 + (0-6)^2 = 100
D1 = 10
Distance D2:
(D2)^2 = (11-1)^2 + (6-6)^2 = 100
D2 = 10
The constant sum is the summation of the two distances as follows:
constant sum = D1 + D2 = 10 + 10 = 20
The correct choice is:
a) 20
Ответ:
B
Step-by-step explanation: dy/dx = (1--4)/(-10-0)
= 5/-10
=-1/2