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:

351°f

step-by-step explanation:

total amount of money that he should pay if he has not used his duty free exemption is $98

step-by-step explanation:

given a united states citizen returning to the states declares the following items at the customs office: 3 shirts at $8.50 each 2 dresses at $27.50 each 1 pair of gold cuff links at $17.50 per pair. we have to find how much he pay

cost of 3 shirts if one cost at $8.50 is

cost of 2 dresses if one cost at $27.50 is  

cost of 1 pair of gold cuff at $17.50

so, total amount of money that he should pay if he has not used his duty free exemption is   $25.5+$55+$17.50=$98