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 
.
Answer:
x=28 cm
Step-by-step explanation:
Ratio of length of bigger sides to smaller sides=20:10=2:1.
Do them backwards and you will get the answer
Answer:
the answer is
6.41
12.78
17.226
Step-by-step explanation:
Answer:
120.
Step-by-step explanation:
210 * 4/7
= 30 * 4
= 120.
