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4 years ago

25 problems.you have done 20% how many problems have you done

Mathematics

2 answers:

Kitty [74]4 years ago

8 0

25 problems and you have done 20%

= 20/100 * 25
= 0.2 * 25
= 5
You have done 5 problems out of 25

Lemur [1.5K]4 years ago

3 0

20% is 1/5 of the 25 problems, so 1/5 of 25 is equal to 5 (25/5=5)

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X/3 - ( -2) =16 and its 7 th grade algebra btw i need help

Novosadov [1.4K]

Answer x/3 -(-2)= 16

X/3+ 2=16

X/3=16-2

X/3=14

X= 14x3=42

Step-by-step explanation:

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3 years ago

Pls answer this (aka Sophia lol)

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Answer:

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3 years ago

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Is 6-6 and 1-6 equal

uranmaximum [27]

Answer:

Step-by-step explanation:

6-6=0

1-6=-5

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3 years ago

Suppose the standard deviation of X is 6 and the standard deviation of Y is 8. Answer the following two questions, rounding to t

Darina [25.2K]

Recall that

Var[aX + bY] = a ² Var[X] + 2ab Cov[X, Y] + b ² Var[Y]

Then

Var[3X - 7Y] = 9 Var[X] - 42 Cov[X, Y] + 49 Var[Y]

Now, standard deviation = square root of variance, so

Var[3X - 7Y] = 9×6² - 42×2 + 49×8² = 3376

The general result is easy to prove: by definition,

Var[X] = E[(X - E[X])²] = E[X ²] - E[X]²

Cov[X, Y] = E[(X - E[X]) (Y - E[Y])] = E[XY] - E[X] E[Y]

Then

Var[aX + bY] = E[((aX + bY) - E[aX + bY])²]

… = E[(aX + bY)²] - E[aX + bY]²

… = E[a ² X ² + 2abXY + b ² Y ²] - (a E[X] + b E[Y])²

… = E[a ² X ² + 2abXY + b ² Y ²] - (a ² E[X]² + 2 ab E[X] E[Y] + b ² E[Y]²)

… = a ² E[X ²] + 2ab E[XY] + b ² E[Y ²] - a ² E[X]² - 2 ab E[X] E[Y] - b ² E[Y]²

… = a ² (E[X ²] - E[X]²) + 2ab (E[XY] - E[X] E[Y]) + b ² (E[Y ²] - E[Y]²)

… = a ² Var[X] + 2ab Cov[X, Y] + b ² Var[Y]

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3 years ago

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WITCHER [35]

Answer:

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Step-by-step explanation:

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S = 5.2 + 13.6

S = 18.8

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4 years ago

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