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3 years ago

)) Two window washers, Hector and Michael, lean a ladder against the side of a building so

Mathematics

2 answers:

Anika [276]3 years ago

8 0

Answer: Seems like it would depend on your base. Can you pull the ladder away from the window and let it go and it drops back to the original position? I would prefer an extension ladder with a set off just below the frame so that I can reach both panes without the ladder blocking me. If the extension ladder won’t reach I would use the WFP (and might use that anyway).

ArbitrLikvidat [17]3 years ago

6 0

<h3>Answer: 15 ft</h3>

===================================================

Work Shown:

Refer to the diagram below.

a = 12 and b = 9 are the legs of the right triangle

c = unknown hypotenuse, which is the length of the ladder.

Use the Pythagorean theorem to solve for c

a^2+b^2 = c^2

12^2+9^2 = c^2

144+81 = c^2

225 = c^2

c^2 = 225

c = sqrt(225)

c = 15

The ladder is 15 feet long.

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Kirsten runs an experiment for her Research Methods class in which she studies vocabulary learning in introductory-level French

Sidana [21]

Answer:

Kristen should use the paired t-test.

Step-by-step explanation:

The dependent t-test (also known as the paired t-test or paired-samples t-test) compares the two means associated groups to conclude if there is a statistically significant difference between these two means.

We use the paired t-test if we have two measurements on the same item, person or thing. We should also use this test if we have two items that are being measured with a unique condition.

For instance, an experimenter tests the effect of a medicine on a group of patients before and after giving the doses.

In this case, Kristen assesses the students' knowledge of French vocabulary at the start of the semester and then again at the end of the semester.

So, she collects data before and after the semester for vocabulary learning in introductory-level French class.

Thus, she is using a paired t-test to analyze whether the French students significantly increased their knowledge of French vocabulary.

The hypothesis is defined as:

H₀: There is no difference between the two means, i.e. μ₁ - μ₂ = 0.

Hₐ: There is a significant difference between the two means, i.e. μ₁ - μ₂ ≠ 0.

The test statistic is:

t = Sample mean difference ÷ (Standard deviation of difference/ Sample size)

Thus, Kristen should use the paired t-test.

7 0

3 years ago

What is the measure of side opposite to 45 degree if the side opposite to 90 degree is 4

Katarina [22]

Answer:

$2\sqrt{2}$

Step-by-step explanation:

if the given figure is triangle, then the required length can be calculated:

$\frac{4}{\sqrt{2} } =2\sqrt{2}.$

additional info: sin45°=1/√2.

3 0

2 years ago

Please please someone help

labwork [276]

The answer is letter D.
I hope this helps and pls mark me as brainliest

8 0

3 years ago

If a and b are prime numbers, which of the following cannot be the sum of a and b?

zhuklara [117]

The answer is J.
11+2=13
13+3=16
11+7=18
11+17=27
The sum of prime numbers do not equal 25.

7 0

3 years ago

Is being gay wrong? also why do spiders protect frogs?

Serggg [28]

Answer:

No.. i dont think its wrong.

Step-by-step explanation: Spiders protect frogs for protection.

3 0

2 years ago