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sladkih [1.3K]
3 years ago
15

-3/4 - 1/5 divide by 2/5 = ? can you explain how to work this problem also

Mathematics
1 answer:
sweet-ann [11.9K]3 years ago
7 0

<u>Answer:</u>

-2\frac{3}{8}

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

We are given the following expression and we are to solve it:

\frac{-\frac{3}{4} -\frac{1}{5} }{\frac{2}{5} }

Firstly, we will take the LCM of the fractions in the denominator to make it a single fraction and then solve further:

\frac{\frac{-3(5)-1(4)}{20} }{\frac{2}{5} }

\frac{\frac{-15-4}{20} }{\frac{2}{5}}

\frac{-\frac{19}{20} }{\frac{2}{5} }

Changing the division into multiplication by taking a reciprocal of the denominator:

-\frac{19}{20} *\frac{5}{2}

-\frac{19}{8}

-2\frac{3}{8}

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Option A: The height of the cylinder is equal to the diameter of the sphere.

Option C: The radius of the sphere is half the height of the cylinder.

Option E: The volume of the sphere is two-thirds the volume of the cylinder.

Solution:

The sphere is inside the cylinder.

Let r be the radius of the sphere.

Option A: The height of the cylinder is equal to the diameter of the sphere.

The sphere is fully occupied the cylinder.

If we draw the vertical line through enter of the sphere, which is equal to the height of cylinder.That is h = d. It is true.

Option B: The height of the cylinder is two times the diameter of the sphere.

That is h = 2d. From the above option, we know that h = d.

So, it is not true.

Option C: The radius of the sphere is half the height of the cylinder.

we know that diameter = 2 × radius (d = 2r)

From option A, we have h = d.

Substitute d = 2r, we get

⇒ h = 2r

Divide by 2 on both sides, we get

$\Rightarrow \frac{h}{2}=r

Therefore, it is true.

Option D: The diameter of the sphere is equal to the radius of the cylinder.

It is not true, because diameters of both cylinder and sphere are equal.

Option E: The volume of the sphere is two-thirds the volume of the cylinder.

Radius of cylinder and sphere = r

Height of cylinder h = 2r (by option C)

Volume of cylinder = Volume of sphere

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$\Rightarrow \pi r^2 (2r) = \frac{2\times2}{3} \pi r^3

$\Rightarrow 2 \pi r^3= \frac{2}{3} \times 2\pi r^3

Hence it is true.

Option A, option C and option E are true.

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<h3>What is geometric transformation?</h3>

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From the graph:

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The line equation passing through two points:

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Learn more about the geometric transformation here:

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