The answer of this question is 22
101
1 answer:
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Answer:
1156
Step-by-step explanation:
When Deucalion threw one stone over his shoulder, 8 people appear. So, for every stone, we have 8 new people.
Therefore, if Deucalion threw 68 stones, the number of people that would appear is
Instead, when Phyrra threw a stone, 9 people appear. So, for every stone, we have 9 new people.
Therefore, if Phyrra threw 68 stones, the number of people that would appear is
And so, we can now calculate the total number of people that appear after each had thrown 68 stones:
We have the equation
Let's complete the square, to do it let's add and subtract 25 on the right side
Now we can have y in function of x
Now we can already identify the vertex because it's in the vertex form:
Where the vertex is
As we can see, h = 5 and k = -2, then the vertex is
Now we can continue and find the focus, the focus is
We have a = 1/20, therefore
The focus is
And the last one, the directrix, it's
Then
Hence the correct answer is: vertex (5, -2); focus (5, 3); directrix y = -7