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babysune01
07.05.2020 •
Mathematics
It takes Chen 32 minutes to edit a commercial. How many commercials can
he edit in 288 minutes?
A. 7 commercials
B. 8 commercials
C. 6 commercials
D. 9 commercials
Solved
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Ответ:
D. 9 commercials
Step-by-step explanation: 32 times 9 = 288 or 288/32 = 9
Ответ:
Ответ:
Step-by-step explanation:
Relation between focus, vertex and directrix-
The vertex of the parabola is at equal distance between focus and the directrix. As any point on the parabola is equidistant from both focus and directrix.
And the directrix is always perpendicular to axis of symmetry and does not touch the parabola.
From the graph, the focus is at (3, 0) and axis of symmetry is x axis or y=0 line.
So the directrix will be horizontal and on the left of the parabola.
Hence, the equation of directrix of the given parabola will be x= -3