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lions [1.4K]
2 years ago
12

Please solve this question thank you

Mathematics
1 answer:
SVETLANKA909090 [29]2 years ago
6 0

Answer:

angle ABC = 30°

Step-by-step explanation:

I attached a picture. if any part is not understandable leave a comment.

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Read this E[2X^2 â€" Y].
djyliett [7]

Looks like a badly encoded/decoded symbol. It's supposed to be a minus sign, so you're asked to find the expectation of 2<em>X </em>² - <em>Y</em>.

If you don't know how <em>X</em> or <em>Y</em> are distributed, but you know E[<em>X</em> ²] and E[<em>Y</em>], then it's as simple as distributing the expectation over the sum:

E[2<em>X </em>² - <em>Y</em>] = 2 E[<em>X </em>²] - E[<em>Y</em>]

Or, if you're given the expectation and variance of <em>X</em>, you have

Var[<em>X</em>] = E[<em>X</em> ²] - E[<em>X</em>]²

→   E[2<em>X </em>² - <em>Y</em>] = 2 (Var[<em>X</em>] + E[<em>X</em>]²) - E[<em>Y</em>]

Otherwise, you may be given the density function, or joint density, in which case you can determine the expectations by computing an integral or sum.

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Which of the following sets is closed under multiplication? {0, 1, 2, 4} {0, 1} {1, 2}
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It would be {0,1} :)
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The area of a
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area=l×w

l=area/w

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perimeter=22

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2 years ago
Three times the cost is $24
jeka94
8 because 24 divided by 3 is eight 
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<span>1 hundreds + 5 tens + 12 ones

= 100 + 50 + 12 

= 162</span>
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