66/80 Marks
2 answers:
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Answer:
the vertex of the parabola is:(-2,0)
the focus of the parabola is:(-2,)
the directrix of the parabola is:y=
Step-by-step explanation:
we know that for any general equation of the parabola of the type the vertex of the parabola is given by (h,k)
where and
therefore by the given data we have h=-2 and k=0
hence vertex=(-2,0)
the general equation of the parabola of the type ; the parabola symmetric around the y-axis has the focus from the centre i.e. the vertex (h,k) at a distance a as (h,k+a) and the directrix is given by y=k-a
so focus is
now the directrix of the parabola is .
The total electric energy bill for the month is
<u>Solution: </u>
Given that
Electric energy consumed by family in a month = 1303 kWh
Power Company charges per kilowatt hour
Need to calculate total electric energy bill for the month.
Price of 1 kilowatt hour =
Total electric energy bill for the month = Price of Electric energy consumed by family in a month = Price of 1303 kilowatt hour =