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Multiply.<br> (5x + 4)(5x+4)

Nimfa-mama [501]

Answer:

25x^2+40x+16

Step-by-step explanation:

We have to distribute each term to the other terms.

Let's take the first 5x and multiply it by 5x and 4 in the second set of parentheses.

5x*5x+5x*4

25x^2+20x

Now we have to multiply the first 4 by, again, 5x and 4

4*5x+4*4

20x+16

Now we combine the two bolded expressions.

25x^2+20x+20x+16

Now we combine like terms

25x^2+40x+16

Hope this helps!

7 0

3 years ago

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Can someone help me please

Anna007 [38]

Im not sure how to help here sorry friend

7 0

3 years ago

Find the distance between the points (a, 0) and (0, b).

padilas [110]

Answer:

d = sqrt( a^2 + b^2)

Step-by-step explanation:

Formula

d = sqrt( (x2 - x1)^2 + (y2 - y1)^2 )

Givens

x1 = a

x2 = 0

y1 = 0

y2 = b

Solution

d = sqrt( (0 - a)^2 + (b - 0)^2 )

d = sqrt( a^2 + b^2)

which is another way of writing the Pythagorean theorem.

6 0

3 years ago

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Mean birthweight is studied because low birthweight is an indicator of infant mortality. A study of babies in Norway published i

goldenfox [79]

Answer:

Step-by-step explanation:

Download docx

6 0

3 years ago

A true-false quiz with 10 questions was given to a statistics class. Following is the probability distribution for the score of

disa [49]

Answer:

$E(X)=\sum_{i=1}^n X_i P(X_i)$

And if we use the values obtained we got:

$E(X)=5*0.05 +6*0.15 +7*0.33 +8*0.28+ 9*0.12 +10*0.07=7.48$

For this case this value means that the expected score is about 7.48

Step-by-step explanation:

For this case we assume the following probability distribution:

X 5 6 7 8 9 10

P(X) 0.05 0.15 0.33 0.28 0.12 0.07

First we need to find the expected value (first moment) and the second moment in order to find the variance and then the standard deviation.

In order to calculate the expected value we can use the following formula:

$E(X)=\sum_{i=1}^n X_i P(X_i)$

And if we use the values obtained we got:

$E(X)=5*0.05 +6*0.15 +7*0.33 +8*0.28+ 9*0.12 +10*0.07=7.48$

For this case this value means that the expected score is about 7.48

In order to find the standard deviation we need to find first the second moment, given by :

$E(X^2)=\sum_{i=1}^n X^2_i P(X_i)$

And using the formula we got:

$E(X^2)=(5^2 *0.05)+(6^2 *0.15)+(7^2 *0.33)+(8^2 *0.28)+ (9^2 *0.12 +(10^2 *0.07))=57.46$

Then we can find the variance with the following formula:

$Var(X)=E(X^2)-[E(X)]^2 =57.46-(7.48)^2 =1.5096$

And then the standard deviation would be given by:

$Sd(X)=\sqrt{Var(X)}=\sqrt{1.5096}=1.229$

5 0

4 years ago

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6x1/6 gente me ajudaaaa kakakkw e pra um teste de matematica RESPONDE EM PORTUGUES PFV​

6x1/6 gente me ajudaaaa kakakkw e pra um teste de matematica RESPONDE EM PORTUGUES PFV