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3 years ago

Solve for y. y = 2x +5 ; when x= 2.

Mathematics

2 answers:

mixer [17]3 years ago

4 0

Y=2(2)+5
y=4+5
y=9

The answer for Y would be 9 by substituting! :)

Mila [183]3 years ago

3 0

Answer: To find the x-intercept, substitute in

for

and solve for

−

Solve the equation.

To find the y-intercept, substitute in

for

and solve for

(

)

−

Simplify

(

)

−

These are the

and

intercepts of the equation

−

x-intercept:

(

)

y-intercept:

(

−

)

Plz brainliest thx (:

Step-by-step explanation:

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50 POINTS EACH HEEEEELP !!!!!

Phoenix [80]

Hello there,

The <em>answer is </em>A' (-3,2).

<h3>Step-by-step explanation:-</h3>

From the image shown on the xy-plane, the coordinate of point A is at (3,-2).

The rule for rotation by 180° about the origin is (x,y)→(-x, -y), where (x,y) is the coordinate of image and (-x, -y) is the coordinate of the resulting pre-image.

Given the coordinate point A(3,-2), if this coordinate is rotated 180°, the resulting point A' will be located at (-3,-(-2)) = (-3,2).

Therefore, the answer will be <u>A'(-3,2)</u>

✍️ <em>by </em><em>Benjemin</em> ☺️

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3 years ago

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Two angles that are supplementary are always linear pair true or false?

insens350 [35]

The answer would be True

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Linda planned to spend 9 hours practicing piano this week. By tuesday,she had spent 2 1/2 hours practising. How much longer does

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3 years ago

Help find DC Please

Ymorist [56]

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Step-by-step explanation:

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3 years ago

5. The superintendent of the local school district claims that the children in her district are brighter, on average, than the g

anygoal [31]

Answer:

We conclude that children in district are brighter, on average, than the general population.

Step-by-step explanation:

We are given the following data set:

105, 109, 115, 112, 124, 115, 103, 110, 125, 99

Formula:

$\text{Standard Deviation} = \sqrt{\displaystyle\frac{\sum (x_i -\bar{x})^2}{n-1}}$

where $x_i$ are data points, $\bar{x}$ is the mean and n is the number of observations.

$Mean = \displaystyle\frac{\text{Sum of all observations}}{\text{Total number of observation}}$

$Mean =\displaystyle\frac{1117}{10} = 111.7$

Sum of squares of differences = 642.1

$S.D = \sqrt{\frac{642.1}{49}} = 8.44$

We are given the following in the question:

Population mean, μ = 106

Sample mean, $\bar{x}$ = 111.7

Sample size, n = 10

Alpha, α = 0.05

Sample standard deviation, s = 8.44

First, we design the null and the alternate hypothesis

$H_{0}: \mu = 106\\H_A: \mu > 106$

We use one-tailed(right) t test to perform this hypothesis.

Formula:

$t_{stat} = \displaystyle\frac{\bar{x} - \mu}{\frac{s}{\sqrt{n}} }$

Putting all the values, we have

$t_{stat} = \displaystyle\frac{111.7 - 106}{\frac{8.44}{\sqrt{10}} } = 2.135$

Now,

$t_{critical} \text{ at 0.05 level of significance, 9 degree of freedom } = 1.833$

Since,

$t_{stat} > t_{critical}$

We fail to accept the null hypothesis and reject it. We accept the alternate hypothesis.

We conclude that children in district are brighter, on average, than the general population.

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3 years ago