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2 years ago

Loneliness is the "best" anyone wanna ch.at like actually ch.at without just leaving me hanging there

Mathematics

1 answer:

Westkost [7]2 years ago

5 0

Answer:

sure lets talk im bor ed

Step-by-step explanation:

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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 2X ² - Y.

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

E[2X ² - Y] = 2 E[X ²] - E[Y]

Or, if you're given the expectation and variance of X, you have

Var[X] = E[X ²] - E[X]²

→ E[2X ² - Y] = 2 (Var[X] + E[X]²) - E[Y]

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.

6 0

3 years ago

This is confusing (2x+y)^2−(x−2y)^2

Iteru [2.4K]

Answer:

${(2x + y)}^{2} - {(x - 2y)}^{2}$

$< {(x + y)}^{2} = {x}^{2} + 2xy + {y}^{2} >$

$< {(x - y)}^{2} = {x}^{2} - 2xy + {y}^{2} >$

${(2x)}^{2} + 2(2x)(y) + {(y)}^{2} - {(x)}^{2} - 2(x)(2y) + {(2y)}^{2}$

${4x}^{2} + 4xy + {y}^{2} - {x}^{2} - 4xy + {4y}^{2}$

${4x}^{2} - {x}^{2} + {4y}^{2} + {y}^{2}$

$= {3x}^{2} + {5y}^{2}$

5 0

3 years ago

Read 2 more answers

Simplify -2a(7a^5-5a+5)

olga_2 [115]

Here here here here here here here

3 0

2 years ago

What is the value of x?

tigry1 [53]

Sense -4 and +2 would be 6 digits away from each other, we would then have to figure out, what would 4 times x - 2 would equal "x".

We would do, 4×2 = 8.

8 - 2 = 6.

Sense 6 is the amount of how much -4 and +2 would be from each other, this would then mean that x would then equal 8.

$\boxed{x=8}$

3 0

3 years ago

Ann sleeps 8 hours per night. Write an expression for the number of hours Ann sleeps in n nights.

lord [1]

8n. 8 represents the number of hours she sleeps, and n represents the number of night she sleeps.

8 0

3 years ago