The intersection of two sets is the set composed by the elements that the two sets have in common.
So, we have
In this particular case, since Y is a subset of X, we have
In fact, all elements of Y are elements of X as well, so in particular they are common elements.
Let x be the unknown angle.
We know that x+50=120 because the value of an exterior angle of a triangle is equal to the sum of the other 2 interior angles.
x+50 = 120
Subtract both sides by 50
x = 70
The value of the unknown angle is 70 degrees.
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Standard Normal Distribution. As discussed in the introductory section, normal distributions do not necessarily have the same means and standard deviations. A normal distribution with a mean of 0 and a standard deviation of 1 is called a standard normal distribution.
Answer:
what
Step-by-step explanation:
