90cm on of the each f and g
27 millimeters multiplied by 1 cm/10 mm= 2.7 centimeters
So I was always taught to list out the multiples.
5,000:5,000 10,000 15,000 20,000 25,000 30,000 35,000 40,000
8,000:8,000 16,000 24,000 32,000 40,000
You can see more clearly that the first multiple they share is 40,000 yds
Hope that helps
Standard form is, hold a sec
x=2 is directix
that means it opens left or right
so we must use
(y-k)²=4p(x-h)
where vertex is (h,k) and p is distance from focus to vertex
also shortest distance from vertex to directix
the shortest distance from focus to directix is 2p
if p>0 then the parabola opens right
if p<0 then pareabola opens left
so
(-2,0) and x=2
the distance is 4
4/2=2
p=2
wait, positive or negative
focus is to the left of the directix so p is negative
p=-2
vertex is 2 to the right of the focus and 2 to the left of directix
vertex is (0,0)
so
(y-0)²=4(-2)(x-0) or
y²=-8x is da equation
not sure what form is standard tho
