A quadrilateral has four angles.
1 answer:
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Answer:
a. P=0.35
b. P=0.12
c. P=0.49
d. Cost: more than $249 per night.
Step-by-step explanation:
We assume a normal distribution with mean $204 and s.d of $55.
To calculate the probability we calculate the z-value for each case
a. What is the probability that a hotel room costs $225 or more
b. What is the probability that a hotel room costs less than $140
c. What is the probability that a hotel room costs between $200 and $300
d. What is the cost of the most expensive 20% of hotel rooms in New York City?
In this case, we have to estimate z' so thats P(z>z')=0.2. This value is z=0.841.
Then, the value of X should be:
By <em>direct</em> substitution, the <em>polynomic</em> equation y(x) = 1 + a · x + b · x² represents a solution of the <em>differential</em> equation for a = - 2, b = 1/2 and n = 2.
<h3>How to analyze a differential equation</h3>
In this question we need to analyze a kind of <em>differential</em> equation known of the Laguerre's equation. <em>Differential</em> equations are equations that involves derivatives.
Now we proceed to prove if the expression y(x) = 1 + a · x + b · x² represents a solution of the Laguerre's equation:
(1)
The proof consists in substituting each term and simplify the resulting expression:
x · (2 · b) + (1 - x) · (2 · b · x + a) + n · (1 + a · x + b · x²) = 0
2 · b · x + 2 · b · x - 2 · b · x² + a - a · x + n + a · n · x + b · n · x² = 0
(- 2 · b + b · n) · x² + (4 · b - a + a · n) · x + (a + n) = 0
The following conditions must be fulfilled:
- 2 + n = 0 (1)
4 · b - a + a · n = 0 (2)
a + n = 0 (3)
By (1) and (3):
n = 2, a = -2
And by (2):
4 · b - (- 2) + (- 2) · (2) = 0
4 · b - 2 = 0
b = 1/2
By <em>direct</em> substitution, the <em>polynomic</em> equation y(x) = 1 + a · x + b · x² represents a solution of the <em>differential</em> equation for a = - 2, b = 1/2 and n = 2.
To learn more on differential equations: brainly.com/question/14620493
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