Alamp has a power of 120 w and is left on for 24 hours . a television has a power of 350 w and is left on for three hours . compares the energy used by these devices

y=-2

Step-by-step explanation:

Which is the directrix of a parabola with equation X^2=8y

The directrix is given by y=k−p

(h,k+p).focus of a parabola is given by (h,k+p).

(x−h)^2=4p(y−k), is known as the equation of a parabola

X^2=8y

comparing we have

(x−h)^2=x^2

x=x-h

h=0

4p(y−k)=8y

k=0

4py=8y

p=2

recall the directrix is given by  y=k−p

y=0-2

y=-2

Parabola is a curve such that any point is at equidistant from the focus