Which is the equation of a hyperbola with directrices at y = ±2 and foci at (0, 4) and (0, −4)?

Step-by-step explanation:

Step-by-step explanation:

The foci of the hyperbola 0, 4) and (0, −4) are on the y-axis.

This means that the vertices of the hyperbola are on the y-axis.

Such hyperbola has equation

The directrices of the hyperbola is given by:

We compare this to the given directrices: to get:

The foci of the hyperbola 0, 4) and (0, −4);

This implies that: or

We put c=4 into equation 1 to get:

Also recall that for the hyperbola; we have:

This implies that:

The equation of the hyperbola becomes:

e.

step-by-step explanation:

because there are always 10 numbers in a phone number.

sine

step-by-step explanation: