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4 years ago

PLEASE HELP!!!!!!!!!!!!!

1 answer:

8 0

$4y^2+2=(4y\cdot4y)+2\\
4y^2+2=16y^2+2 \leftarrow \text{not identity}\\\\
4y^2+2=(4y+y)+2\\
4y^2+2=5y+2 \leftarrow \text{not identity}\\\\
4y^2+2=4(y+y)+2\\
4y^2+2=8y+2 \leftarrow \text{not identity}\\\\
4y^2+2=4(y\cdot y)+2\\
4y^2+2=4y^2+2 \leftarrow \text{identity}$

So it's D.

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Wire electrical-discharge machining (WEDM) is a process used to manufacture conductive hard metal components. It uses a continuo

algol13

Answer:

a. no, there are no sufficient data to use

b. assumption b is right

Step-by-step explanation:

a. for the standard deviation to be calculated at 99% confidence, the data needed should be the mean (given), the variate value to be calculated for(not given), the standard deviation(not given), the z value of the normal distribution ( not given),

since there are too many unknown, the data given are not sufficient to calculate.

b. validity of this interval requires that coating layer thickness be at least approximately normally distributed.

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4 years ago

A rocket is launched from a tower. The height of the rocket, y in feet, is related to the time after launch, t in seconds, by th

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Answer:

Step-by-step explanation:

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3 years ago

HELP! 25 points! I'm really bad at math and need to find out the angle of x

ICE Princess25 [194]

angle CEB and AED are corresponding angles, so they are both are equal

since we already know that CEB is equal to 160, that means that AED is also equal to 160

all you have to do to find the value of x is subtract the 115 from 160, and so you get 45

so, x=45

hope this helps!! :)

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3 years ago

For the following discrete random variable X with probability distribution:

Black_prince [1.1K]

Answer:

(a) The probability distribution is shown in the attachment.

(b) The value of E (Y) is 7.85.

(d) The value of P (Y ≤ 2) is 0.60.

(e) Verified that the value of E (Y) is 7.85.

Step-by-step explanation:

(a)

The random variable Y is defined as: $Y=3X^{2}-2X+1$

For X = {0, 1, 2, 3} the value of Y are:

$X=0;\ Y=3\times(0)^{2}-2\times(0)+1 =1$

$X=1;\ Y=3\times(1)^{2}-2\times(1)+1 =2$

$X=2;\ Y=3\times(2)^{2}-2\times(2)+1 =9$

$X=3;\ Y=3\times(3)^{2}-2\times(3)+1 =22$

The probability of Y for different values are as follows:

P (Y = 1) = P (X = 0) = 0.20

P (Y = 2) = P (X = 1) = 0.40

P (Y = 9) = P (X = 2) = 0.15

P (Y = 22) = P (X = 3) = 0.25

The probability distribution of Y is shown below.

(b)

The expected value of a random variable using the probability distribution table is:

$E(U)=\sum[u\times P(U=u)]$

Compute the expected value of Y as follows:

$E(Y)=\sum [y\times P(Y=y)]\\=(1\times0.20)+(2\times0.40)+(9\times0.15)+(22\times0.25)\\=7.85$

Thus, the value of E (Y) is 7.85.

(c)

Compute the expected value of X as follows:

$E(X)=\sum [x\times P(X=x)]\\=(0\times0.20)+(1\times0.40)+(2\times0.15)+(3\times0.25)\\=1.45$

Compute the expected value of X² as follows:

$E(X^{2})=\sum [x^{2}\times P(X=x)]\\=(0^{2}\times0.20)+(1^{2}\times0.40)+(2^{2}\times0.15)+(3^{2}\times0.25)\\=3.25$

Thus, the value of E (X) and E (X²) are 1.45 and 3.25 respectively.

(d)

Compute the value of P (Y ≤ 2) as follows:

$P (Y\leq 2)=P(Y=1)+P(Y=2)=0.20+0.40=0.60$

Thus, the value of P (Y ≤ 2) is 0.60.

(e)

The value of E (Y) is 7.85.

$E(Y)=E(3X^{2}-2X+1)=3E(X^{2})-2E(X)+1$

Use the values of E (X) and E (X²) computed in part (c) to compute the value of E (Y).

$E(Y)=3E(X^{2})-2E(X)+1\\=(3\times 3.25)-(2\times1.45)+1\\=7.85$

Hence verified.

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3 years ago

How do you write -2 5/22 as a decimal

Dimas [21]

Dividing 5 by 22 gives 0.227 to nearest thousandth
Answer is -2.227

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4 years ago