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4 years ago

Simplify the expression:z2-z(z+3)+3z

Mathematics

1 answer:

n200080 [17]4 years ago

8 0

$z^2-z(z+3)+3z=z^2-z\cdot z-z\cdot3+3z=z^2-z^2-3z+3z=0$

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Need help with this question

Burka [1]

Answer:

See the attached.

Step-by-step explanation:

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4 years ago

Use the given data to find the best predicted value of the response variable. Ten pairs of data yield requals0.003 and the regre

Arada [10]

Answer:

$\hat y=3(2) +2=8$

Step-by-step explanation:

Data given

r=0.003 represent the correlation coefficient

$bar y =5$ represent the sample mean for the y observations

Solution to the problem

We assume that they use least squares in order to find the best regression model. The slope is given by the following formula:

$m=\frac{S_{xy}}{S_{xx}}$

Where:

$S_{xy}=\sum_{i=1}^n x_i y_i -\frac{(\sum_{i=1}^n x_i)(\sum_{i=1}^n y_i)}{n}$

$S_{xx}=\sum_{i=1}^n x^2_i -\frac{(\sum_{i=1}^n x_i)^2}{n}$

And the slope on this case is:

$m=3$

Nowe we can find the means for x and y like this:

$\bar x= \frac{\sum x_i}{n}=5$

$\bar y= \frac{\sum y_i}{n}$

And we can find the intercept using this:

$b=\bar y -m \bar x=5-(3*\bar x)=2$

So the line would be given by:

$\hat y=3x +2$

And the best predicted value for x=2 would be:

$\hat y=3(2) +2=8$

3 0

3 years ago

Find the radius of a circle with a circumference of 49 yards

Mars2501 [29]

Answer:

7.8025

Step-by-step explanation:

You get the circumfence formula 2 * pi * r

since you are looking for the radius divide 49/2 then the answer you get divide it by pi and then you have your radius

i hope this helped<33

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4 years ago

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Examine the equation.

Sedbober [7]

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$- 3x + 18 = 7x$

$7x = - 3x + 18$

Add sides 3x

$+ 3x + 7x = + 3x - 3x + 18$

$10x = 18$

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3 years ago

Read 2 more answers

Whats the area of this

Fantom [35]

Area of a parallelogram= base*height
A=14*8
A=112m²
The area of this figure is 112m²

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3 years ago