The true statement about the directrix is that each directrix of this ellipse is 31.25 units from the center on the major axis.
<h3>How to determine the distance of the directrix?</h3>
The equation of the ellipse is given as:
The above means that:
a^2 = 625
a = 25
b^2 = 225
b = 15
Calculate c using:
c^2 = a^2 - b^2
This gives
c^2 = 625 - 225
Evaluate the difference
c^2 = 400
Evaluate the square root
c = 20
The equation of the directrix is
x - x₀ = ± a²/c
So, we have:
x - x₀ = ± 625/20
Evaluate the quotient
x - x₀ = ± 31.25
This means that, each directrix is 31.25 units from the center on the major axis.
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Answer:
Explanation:
Yellow is energizing without being noisy or irate." "It is a warm, delicate tone, similar to an infant chick, or the glow of daylight in springtime gushing through a window heating up a fix on the rug."
Correct answer is A. Recreation center
Answer:
The size of the sample needed = 67.65
Explanation:
Given that :
The margin of error = 10% = 0.10
The confidence level = 90% = 0.90
Level of significance = 1 - 0.90 = 0.10
At ∝ = 0.10
Since the proportion of people that supported him/her is not given, we assumed p = 0.50
The margin of error formula can be expressed as:
Squaring both sides; we have:
n = 67.65
Therefore, the required sample size = 67.65
Answer: C An unfulfilled pledge by a political leader
Explanation:
The author refers to President Obama´s promise to provide deportation assistance for families, which he hasn´t fulfilled.
As the author recalls her parents being deported by immigration officers without any regard for the union of the family or her safety as a young teenager, she highlights the President´s responsibility for bringing a solution to a problem that has had families greaving over lost family members for too long.
