Please answer these three or at least two of them thank you
1. =
2. =
3. =

1 conductors

2 insulators

3.Modern turnout jackets and pants are made of fire resistant fabrics (mainly Aramids such as Nomex and Kevlar) or polybenzimidazole (PBI).

Answer with explanation:

All of the function are equation of parabola.If the equation of parabola is like this it has vertex at the origin

Out of the four options given,we will check which of the following function has vertex at the origin.

As,only quadratic function:

is of the form,that is Like ,equation 1 and equation 2,that i have written in the beginning.

So,this function has a vertex at the origin.

Option D  

We can check graphically also.

Drawn the graph of

and found that, f(x)= - x²,has vertex at the origin.