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3 years ago

I got the same answer as the example

Mathematics

1 answer:

DaniilM [7]3 years ago

5 0

Answer:

Step-by-step explanation:

2x2=4 4-7=3 3x3=21 21-4=17

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The data below shows how old each of Brad's eight kids were when they started kindergarten.

svp [43]

Answer:

i think its 4

Step-by-step explanation:

re3f3f3f3

4 0

3 years ago

If I am in Vermont, then I am in the North.

raketka [301]

The correct answer is D.

This is because a converse statement switches the places of the hypothesis and conclusion.

6 0

3 years ago

Train tracks are made of metal. Consequently, they expand when it's warm and shrink when it's cold. When riding in a train, you

Nadya [2.5K]

The height of the triangle that forms the train track is 145,38 ft

<h3>How to calculate the height of the triangle?</h3>

To calculate the height of the triangle we must take into account the information provided by

Base of the triangle = 1 mile = 5280 feet
Railroad track expansion = 8 feet

According to the above, we must perform the following operations:

5280 ÷ 2 = 2640
8 ÷ 2 = 4
2640 + 4 = 2644

Subsequently, we must apply the Pythagorean theorem to find the height of the triangle having 2 data:

Base: 2640ft
Hypotenuse: 2644 ft

2644² = x² + 2640²
x² = 2644² - 2640²
x = $\sqrt[2]{2644^{2} + 2640^{2}}$ .
x = $\sqrt[2]{21137}$
x = 145,38 ft

That makes x approximately 145,38 ft.

Learn more about triangles in: brainly.com/question/2269348

4 0

2 years ago

3x + 1 = 2x – 3 Why can't you add 3x with 2x? And what should you do for the first step

Tamiku [17]

Answer:

You can’t add 3x with 2x because to get term to the other side of the equal sign, you need to do the inverse (opposite) of the number. Since 3x is positive (basically with a + in the front) you SUBTRACT 3x for it to get to the other side. Which will get u -1x or just -x.

5 0

2 years ago

An agronomist wishes to estimate, to within one percentage point, the proportion of a new variety of seed that will germinate wh

Galina-37 [17]

Answer:

The minimum sample size must be 1118 to have margin of error within one percentage point.

Step-by-step explanation:

We are given the following in the question:

Germination rate = 97% = 0.97

$\hat{p} = 0.97$

Margin of error = 1% = 0.01

We have to find the minimum sample size for a 95% confidence interval.

Formula for margin of error:

$z_{stat}\times \sqrt{\dfrac{\hat{p}(1-\hat{p})}{n}}$

$z_{critical}\text{ at}~\alpha_{0.05} = 1.96$

Putting values, we get,

$1.96\times \sqrt{\dfrac{0.97(1-0.97)}{n}}\leq 0.01\\\\\sqrt{n} \geq 1.96\times \dfrac{\sqrt{0.97(1-0.97)}}{0.01}\\\\\sqrt{n}\geq 33.4350\\\Rightarrow n \geq 1117.9056$

Rounding off to integer,

$n = 1118$

Thus, the minimum sample size must be 1118 to have margin of error within one percentage point.

4 0

3 years ago