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2 years ago

I need help with these problems please and thank you

Mathematics

2 answers:

AURORKA [14]2 years ago

7 0

Answer:

Refractive index of a medium depends upon the refractive index of the surroundings

artcher [175]2 years ago

4 0

Answer:

5. There are 4 coins in every punch

6. There are 5 coins in every punch

7. There is 1 coin in every punch

8. There aren't coins in the punches

Step-by-step explanation:

$4x+2=18\\4x=18-2\\4x=16\\x=\frac{16}{4} \\x=4$

$3x+5=20\\3x=20-5\\3x=15\\x=\frac{15}{3}\\x=5$

$2x+10=9+3x\\x+-3x=9-10\\-1x=-1\\x=1$

$2x+14=14\\2x=14-14\\2x=0\\x=\frac{0}{2}\\x=0$

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What is the answer to -7(-3n 2)?

sergey [27]

21n+14 you have to find the value of n

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3 years ago

3 Caleb claims that when you multiply a number by 10, you can just write a 0 at the right end of the number. Caleb gives the exa

devlian [24]

Answer:

They are both correct

Step-by-step explanation:

It's interpretation of the concept. In common practice multiplying by 10 means you add a zero and that's what we teach 10 year olds. But what does adding a zero mean? It means adding a place value and that's what you learn when you are

So in both examples just add a decimal:

2.0 x 10 = 20.

0.2 x 10 = 2.0

In conclusion, it depends on the level of precision required in the discussion and the level of maturity as to who is correct in their examples. If you are teaching 3rd graders math, by all means you add a zero. If you are discussing physics you are shifting over a place value.

8 0

3 years ago

Hannah has information about an object in circular orbit around Earth. MEarth = 6. 0 × 1024 kg G = 6. 67 × 10–11 StartFraction m

castortr0y [4]

In order to calculate the tangential speed of the orbiting object Hannah need the distance of the orbiting object to Earth.

<h3>What is the tangential speed of the object?</h3>

The tangential speed of an object is the linear component of the speed, which is moving in a circular path.

In terms of the gravitation constant, the tangential speed can be given as,

$v=\sqrt{\dfrac{Gm}{r}}$

Here, {G} is the gravitation constant, (m) is the mass and (r) is the radius.

Hannah has information about an object in circular orbit around Earth.

The mass of the earth is.

$m_E=6. 0 \times10^{24} kg$

The value of gravitational constant is,

$G=6. 67\times 10{-11}\rm Nm^2/kg^2$

The radius of the earth is,

$r_E=6. 0 \times 10^6 \rm m$

Here, only the distance of the orbiting object to Earth is need to find the tangential speed of the object.

Hence, in order to calculate the tangential speed of the orbiting object Hannah need the distance of the orbiting object to Earth.

Learn more about the tangential speed here;

brainly.com/question/4933588

7 0

2 years ago

Drag each label to the correct location on the image.

eduard

Answer:

See below

Step-by-step explanation:

Given numbers:

5.91E10
0.0000734
2.66 x 10^-3
641,000,000,000

Standard notation:

0.0000734
641,000,000,000

Scientific Notation:

5.91E10
2.66 x 10^-3

3 0

3 years ago

he Boston public school district has had difficulty maintaining on-time bus service for its students. Suppose the district devel

Sergeu [11.5K]

Answer:

Fail to reject the null hypothesis.

Step-by-step explanation:

The hypothesis test is conducted for Boston public school. They have used z-value table and the value of test statistics is 1.20. AT the significance level of 0.05, the null hypothesis is accepted. We cannot reject the null hypothesis. The p-value is greater than alpha so there is no evidence to support the claim of Boston Public School.

4 0

3 years ago