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telo118 [61]
3 years ago
8

Hello:) anyone able to help with this question ? Thank you!

Mathematics
2 answers:
svetlana [45]3 years ago
6 0

Answer:

look at the photo below for the Answer.

:)

OverLord2011 [107]3 years ago
5 0
<h3>Answer: a = 4, b = 2</h3>

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

Explanation:

Multiply both sides by the denominator a+b*sqrt(7). Then expand out the RHS and get that RHS into the form p+q*sqrt(7), where p and q are algebraic expressions.

2+4*sqrt(7) = (4-sqrt(7))(a+b*sqrt(7))

2+4*sqrt(7) = 4(a+b*sqrt(7))-sqrt(7)*(a+b*sqrt(7))

2+4*sqrt(7) = 4a+4b*sqrt(7)-a*sqrt(7)-7b

2+4*sqrt(7) = (4a-7b)+(4b-a)*sqrt(7)

The (4a-7b) part on the RHS matches up with 2 on the LHS, so

2 = 4a-7b or 4a-7b = 2

Similarly, the (4b-a)*sqrt(7) on the RHS matches up with 4*sqrt(7)

So,

4*sqrt(7) = (4b-a)*sqrt(7)

4 = 4b-a

-a+4b = 4

--------------

We have this system of equations

4a-7b = 2 and -a+4b = 4

Let's solve the second equation for a

-a+4b = 4

4b = 4+a

4b-4 = a

a = 4b-4

Plug this into the first equation; solve for b.

4a - 7b = 2

4( a ) - 7b = 2

4(4b-4)-7b = 2

16b-16-7b = 2

9b-16 = 2

9b = 18

b = 2

From here, we can compute the value of 'a'

a = 4b-4

a = 4(2)-4

a = 4

Your method of rationalizing the denominator would work out, though it seems like it would involve more steps.

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A sphere and a cylinder have the same radius and height. The volume of the cylinder is . Amie found the volume of the sphere. He
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Amie's error while measuring the volume of a sphere is that <u>Amie should have multiplied 54 by 2/3</u>. Thus, the <u>first option</u> is the right choice.

In the question, we are given that a sphere and a cylinder have the same radius and height.

We assume the radius of the sphere to be r, and its height to be h.

Now, the height of a sphere is its diameter, which is twice the radius.

Thus, the height of the sphere, h = 2r

Given that the sphere and the cylinder have the same radius and height, the radius of the cylinder is r, and its height is 2r.

The volume of a sphere is given by the formula, V = (4/3)πr³, where V is its volume, and r is its radius.

Thus, the volume of the given sphere using the formula is (4/3)πr³.

The volume of a cylinder is given by the formula, V = πr²h, where V is its volume, r is its radius, and h is its height.

Thus, the volume of the given cylinder using the formula is πr²(2r) = 2πr³.

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Volume of the sphere/Volume of the cylinder

= {(4/3)πr³}/{2πr³}

= 2/3.

Thus, the volume of the sphere/the volume of the cylinder = 2/3,

or, the volume of the sphere = (2/3)*the volume of the cylinder.

Given the volume of the cylinder to be 54 m³, Amie should have multiplied 54 by 2/3 instead of adding the two.

Thus, Amie's error while measuring the volume of a sphere is that <u>Amie should have multiplied 54 by 2/3</u>. Thus, the <u>first option</u> is the right choice.

Learn more about volumes at

brainly.com/question/12398192

#SPJ4

For the complete question, refer to the attachment.

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