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3 years ago

Four times the difference of a number and 5 is the same as 5 increased by four times the number plus five times the number

Mathematics

1 answer:

asambeis [7]3 years ago

4 0

4*(x-5)+5=5+(4*x)+(5*x)

4x-20+5=5+4x+5x

-20+5=5+5x

-15=5+5x

-20=5x

-4=x

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Consider the following regression output where the dependent variable is testscores and the two explanatory variables are the st

jeyben [28]

Answer:

The correct option is (A).

Step-by-step explanation:

The multiple linear regression equation is given by, $y=\alpha +\beta _{1} x_{1}+\beta _{2}x_{2}$ , where α = constant and β $_{i}$ = slope coefficients of regression line.

To test if there is a important relationship amid X $_{i}$ and Y, we use the t-statistic test.

The t-statistic for regression coefficient analysis is given by,

$t=\frac{\beta_{i}}{S.E._{\beta_{i}}}$

The regression equation for test scores dependent upon the two explanatory variables, the student-teacher ratio and the percent of English learners is:

$\text{TestScore} = 698.9 - 1.10 \text{ STR} - 0.650 \text{ PctEL}$

A t-test for the significance of the regression coefficient of variable student-teacher ratio (STR) is conducted.

The test statistic is found to be, t = 2.56.

The regression coefficient of variable STR is, 1.10.

Compute the standard error of the regression coefficient as follows:

$t=\frac{\beta_{i}}{S.E._{\beta_{i}}}$

$S.E._{\beta_{i}}=\frac{\beta_{i}}{t}$

$=\frac{1.10}{2.56}\\\\=0.4296875\\\\\approx 0.43$

The standard error of the regression coefficient is 0.43.

Thus, the correct option is (A).

4 0

3 years ago

10 points to the person who answers this whole thing and I will mark you as brainliest.

olga2289 [7]

Answer:

Step-by-step explanation:

Perimeter is found by adding together all the lengths of the sides. For us, that is x + (2x + 5) + (6x - 17) + (3x + 2). Now we will just combine like terms. We can also drop the parenthesis because they do nothing for us and mean nothing to the problem.

x + 2x + 5 + 6x - 17 + 3x + 2 becomes

12x - 10

4 0

4 years ago

Using the digits 0-9, at most one time each, create five ordered pair that represent a linear

krok68 [10]

Answer:

(-9, 0), (-8, 1), (-7, 2), (-6, 3) and (-5, 4)

Step-by-step explanation:

From the graph attached,

Ordered pairs which lie on the given line (-9, 0), (0, 3), (3, 4), (6, 5) and (9, 6).

Since all the points lie on the same line, rate of change of the linear function will be defined by the slope of the given line.

Slope of the line passing through (0, 3) and (3, 4) = $\frac{y_2-y_1}{x_2-x_1}$

= $\frac{4-3}{3-0}$

$m_1$ = $\frac{1}{3}$

Now we have to find the ordered pairs which represent a linear function having slope greater than $\frac{1}{3}$ .

So the points will be (-9, 0), (-8, 1), (-7, 2), (-6, 3) and (-5, 4).

Slope of the linear function passing through (-9, 0) and (-8, 1)

$m_2$ = $\frac{y_2-y_1}{x_2-x_1}$

= $\frac{1-0}{-8+9}$

= 1

Here $m_2>m_1$

6 0

3 years ago

The perimeter of the cover of a math textbook is 34 inches. if the width of the cover is 7 inches, what is the length of the cov

Sauron [17]

The length would be 10 inches.
to find perimeter, you add length+length+width+width.
since both widths and both lengths have to be the same, u add the width 2 times or 7+7=14.
next u subtract 14 from 34 or 34-14=20.
since u still have 2 lengths that are equal, u divide 20 by 2 or 20/2=10

hope this helps! :)

7 0

3 years ago

X = a. 100 b. 120 c. 140

strojnjashka [21]

Answer:

Step-by-step explanation:

c because 40-180 is140

5 0

3 years ago