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3 years ago

What are zeros of f(x) = (x-3)(x+8)?

Mathematics

1 answer:

Oduvanchick [21]3 years ago

5 0

Answer:

The zeros are -8,3

Step-by-step explanation:

We can use the zero product property which says set each of the factors equal to zero

0 = (x-3)(x+8)

x-3 = 0 x+8 = 0

x-3+3=0=3 x+8-8 = 0-8

x= 3 x = -8

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Answer:

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Step-by-step explanation:

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2 years ago

Fatima is on the track team. One day at practice, it took her 19 minutes to run 2 miles. Select the expression that gives this a

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Step-by-step explanation:

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2 years ago

What is the first term in the sequence for which d = -2 and a7 = 3?

lana66690 [7]

Answer:

First term is 15

Step-by-step explanation:

Given data:

$a_{7} =3\\d=-2$

Now,

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Correct option is (c)

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2 years ago

The accompanying data on x = current density (mA/cm2) and y = rate of deposition (µm/min) appeared in an article. Do you agree w

Sever21 [200]

Answer:

$r=\frac{4(321)-(200)(5.17)}{\sqrt{[4(12000) -(200)^2][4(8.6861) -(5.17)^2]}}=0.98726$

So then the correlation coefficient would be r =0.98726

And the determination coeffcient would be:

$r^2 = 0.98726^2 = 0.975$

And that means that the a linear model will explain about 97.5% of the variability in the data. So for this case we can conclude that we have a strong linear relationship.

Step-by-step explanation:

Data given

col1 x 20 40 60 80

col2 y 0.24 1.10 1.71 2.12

Solution to the problem

We can find the correlation coefficient we can use this formula:

$r=\frac{n(\sum xy)-(\sum x)(\sum y)}{\sqrt{[n\sum x^2 -(\sum x)^2][n\sum y^2 -(\sum y)^2]}}$

For our case we have this:

n=4 $\sum x = 200, \sum y = 5.17, \sum xy = 321, \sum x^2 =12000, \sum y^2 =8.6861$

$r=\frac{4(321)-(200)(5.17)}{\sqrt{[4(12000) -(200)^2][4(8.6861) -(5.17)^2]}}=0.98726$

So then the correlation coefficient would be r =0.98726

And the determination coeffcient would be:

$r^2 = 0.98726^2 = 0.975$

And that means that the a linear model will explain about 97.5% of the variability in the data. So for this case we can conclude that we have a strong linear relationship.

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Answer:

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