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Marina CMI [18]
1 year ago
6

I need to know the answer this, please and thank you it’s past my bed time lol

Mathematics
1 answer:
Angelina_Jolie [31]1 year ago
5 0

Answer:

To find the slope-intercept equation of a line, we need the slope (m) and the y-intercept (b).

The slope-intercept equation is noted as:

y=mx+b

To find the slope, we will use the following formula:

m=\frac{y_2-y_1}{x_2-x_1}

Line 1:

The line passes through the points (-1, -4) and (1, 2). Using these points, we will solve the slope:

\begin{gathered} m=\frac{y_{2}-y_{1}}{x_{2}-x_{1}} \\ m=\frac{2-(-4)}{1-(-1)} \\ m=\frac{2+4}{1+1} \\ m=\frac{6}{2}=3 \end{gathered}

Then, using the point (-1, -4), we will solve for b:

\begin{gathered} y=mx+b \\ -4=3(-1)+b \\ -4=-3+b \\ b=-4+3 \\ b=-1 \end{gathered}

Now that we have the values of slope (m) and y-intercept (b), we now know that the slope-intercept form of line 1 is:

\begin{gathered} y=mx+b \\ y=3x-1 \end{gathered}

Line 2:

Following the same process, we will find the slope (m), then the y-intercept (b).

Line 2 passes through points (-4, 0) and (0,4)

\begin{gathered} m=\frac{y_{2}-y_{1}}{x_{2}-x_{1}} \\ m=\frac{4-0}{0-(-4)} \\ m=\frac{4}{0+4} \\ m=\frac{4}{4}=1 \end{gathered}

Then solve for the y-intercept (b) using the point (-4, 0):

\begin{gathered} y=mx+b \\ 0=-4+b \\ b=4 \end{gathered}

The equation would then be:

\begin{gathered} y=mx+b \\ y=x+4 \end{gathered}

Line 3:

Line 3 passes through points (1, 0) and (0,2)

\begin{gathered} m=\frac{y_{2}-y_{1}}{x_{2}-x_{1}} \\ m=\frac{2-0}{0-1} \\ m=\frac{2}{-1}=-2 \end{gathered}\begin{gathered} y=mx+b \\ 0=-2(1)+b \\ 0=-2+b \\ b=2 \end{gathered}

The equation then would be:

\begin{gathered} y=mx+b \\ y=-2x+2 \end{gathered}

Line 4:

Line 4 passes through points (-2, 3) and (2, 1)

\begin{gathered} m=\frac{y_{2}-y_{1}}{x_{2}-x_{1}} \\ m=\frac{1-3}{2-(-2)} \\ m=\frac{-2}{4}=-\frac{1}{2} \end{gathered}\begin{gathered} y=mx+b \\ 3=-\frac{1}{2}(-2)+b \\ 3=1+b \\ b=3-1 \\ b=2 \end{gathered}

The equation is then:

y=-\frac{1}{2}x+2

With all these, we can write each line's corresponding letter:

Line 1: A

Line 2: E

Line 3: B

Line 4: G

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According to a study done by Wakefield Research, the proportion of Americans who can order a meal in a foreign language is 0.47.
UNO [17]

Answer:

Probability that the proportion of Americans who can order a meal in a foreign language is greater than 0.5 is 0.19766.

Step-by-step explanation:

We are given that according to a study done by Wake field Research, the proportion of Americans who can order a meal in a foreign language is 0.47.

Suppose a random sample of 200 Americans is asked to disclose whether they can order a meal in a foreign language.

<em>Let </em>\hat p<em> = sample proportion of Americans who can order a meal in a foreign language</em>

The z-score probability distribution for sample proportion is given by;

          Z = \frac{ \hat p-p}{\sqrt{\frac{\hat p(1-\hat p)}{n} } }  ~ N(0,1)

where, \hat p = sample proportion

p = population proportion of Americans who can order a meal in a foreign language = 0.47

n = sample of Americans = 200

Probability that the proportion of Americans who can order a meal in a foreign language is greater than 0.5 is given by = P( \hat p > 0.50)

  P( \hat p > 0.06) = P( \frac{ \hat p-p}{\sqrt{\frac{\hat p(1-\hat p)}{n} } } > \frac{0.5-0.47}{\sqrt{\frac{0.5(1-0.5)}{200} } } ) = P(Z > 0.85) = 1 - P(Z \leq 0.85)

                                                               = 1 - 0.80234 = <u>0.19766</u>

<em>Now, in the z table the P(Z  </em>\leq <em>x) or P(Z < x) is given. So, the above probability is calculated by looking at the value of x = 0.85 in the z table which has an area of 0.80234.</em>

Therefore, probability that the proportion of Americans who can order a meal in a foreign language is greater than 0.5 is 0.19766.

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Answer:

4/3

Step-by-step explanation:

12/9 is equivalent to 4/3, because you can divide both the numerator and denominator by the common factor of 3 and that will give you the correct fraction: 4/3.

Hope this helped.

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what are the hypotheseses for the global test of the multiple regression model with three independent variables
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Answer:

Step-by-step explanation:

For a multiple regression model with 3 independent variables,

Y = A0 + A1X1 + A2X2 + A3X3

The hypotheses for the global test of a multiple regression model are:

Null hypothesis H0: there is no relationship between the slopes - A1, A2, A3 - and the outcome. A1, A2, A3 = 0; R^2 = 0

Alternative hypothesis H1: there is a relationship between at least one of the slopes and the outcome. One of A1, A2, A3 is not equal to zero. R^2 is not equal to zero.

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