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2 years ago

Please help ASAP?!!!!

Mathematics

1 answer:

ra1l [238]2 years ago

4 0

It is C prob i need point lol i’m sorry

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Which is equation of an ellipse of an ellipse with directrices at x=4 and foci at (2,0) (-2,0)

r-ruslan [8.4K]

Answer:

$\frac{x^2}{8} + \frac{y^2}{4}=1$

Step-by-step explanation:

The directrices in this case are vertical lines, so we have a horizontal ellipse. The equation for that ellipse is:

$\frac{(x - h)^2}{a^2} + \frac{(y-k)^2}{b^2}=1$

The center of the ellipse is (h,k), the diretrix is x = d and the foci are given by (h+c, k) and (h-c, k)

So, comparing the foci, we have that k = 0 and:

$h + c = 2$

$h - c = -2$

Adding these two equations, we have:

$2h = 0$

$h = 0$

$c = 2$

We can find the value of a^2 using the property:

$c / a = a / d$

Using c = 2 and d = 4, we have:

$a^2 = c * d$

$a^2 = 8$

Now, to find b^2, we use the property:

$a^2 = b^2 + c^2$

$8 = b^2 + 4$

$b^2 = 4$

So the equation of the ellipse is:

$\frac{x^2}{8} + \frac{y^2}{4}=1$

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2 years ago

Johnathan is driving from Houston to Seattle. After 3 hours, he has traveled 150 miles. After 7 hours, he has traveled 350 miles

Sunny_sXe [5.5K]

Answer:

50mph

Step-by-step explanation:

first divide 150 by 3 and you get 50

then divide 350 by 7 you get 50

and finally divide 500 by 10 and you get 50

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2 years ago

Clara and Miles each improved their yards by planting

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Answer:

Step-by-step explanation:

Rose bushes = 8 dollars

daisy pots = 9 dollars

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2 years ago

Rebecca bought groceries using 50% of her paycheck from her part time job. She saved 75% of the remaining amount of money and ha

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0.75 (1/2x) = 60

60/3 is 20, which is 25% of her remaining money,
So her total remaining money is $80.

Then 80 x 2 = 160

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2 years ago

38. A baseball park's average game attendance is 2035 people. This is 65

marta [7]

Answer:

1970 is the answer for the question "A baseball park's average game attendance is 2035 people. This is 65 more than the average attendance for last year. What was the average game attendance for last year?"

- hope this helps!:)

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2 years ago