What is the length of the altitude of an equilateral triangle with side a?
1 answer:
Answer:
(a√3)/2
Step-by-step explanation:
You can find the height (h) of a equilateral triangle any of several ways. A simple one is to use the Pythagorean theorem.
In the diagram below, h is one leg of the right triangle with a/2 as the other leg and a as the hypotenuse. The Pythagorean theorem gives the relationship as ...
h² + (a/2)² = a²
h² = a² - a²/4 . . . . . . . subtract (a/2)²
h² = a²(1 -1/4) = a²(3/4)
h = √(a²(3/4)) = (a/2)√3
The height is (√3)/2 times the side length.
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Answer:
The probability that the time between the next two calls is between 3 minutes and 7 minutes is 0.2442.
Step-by-step explanation:
Let <em>X</em> = time between calls made to Amazon's customer service.
The average time between calls is, <em>β</em> = 10 minutes.
The random variable <em>X</em> follows an Exponential distribution with parameter
The probability distribution function of <em>X</em> is:
Compute the probability that the time between the next two calls is between 3 minutes and 7 minutes as follows:
Thus, the probability that the time between the next two calls is between 3 minutes and 7 minutes is 0.2442.