Which is the equation of a hyperbola with directrices at x = ±3 and foci at (4, 0) and (−4, 0)? A) x squared over 16 minus y squared over 4 equals 1
B) x squared over 12 minus y squared over 4 equals 1
C) y squared over 16 minus x squared over 4 equals 1
D) y squared over 12 minus x squares over 4 equals 1

-4

step-by-step explanation:

(-4+8)=-(4-8)=-8+4=-4

the answer is 2/54

step-by-step explanation:

idk

step-by-step explanation:

fabric (square meters)                   cloaks

7                                                           21

4/3                                                         4

step-by-step explanation:

we are told that harry needs 2 square meters of fabric for every 6 wizard cloaks he makes.

1. first of all we will find how many cloaks can be made from 1 square meter of fabric by dividing 6 by 2.

we can see that 3 cloaks can be made from 1 square meter of fabric. now we will multiply 3 by 7 to find number of cloaks made from 7 square meters of fabric.

therefore, harry will make 21 cloaks from 7 square meters of fabric.

2. let us find how many square meters of fabric will be needed to make 4 cloaks.

first of all we will find fabric needed for 1 cloak by dividing 2 by 6.

we can see that fabric needed for 1 cloak is   square meter. now we will multiply   by 4 to find fabric needed for 4 cloaks.