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4 years ago

Can i solve an addition to different variables

Mathematics

1 answer:

Yuliya22 [10]4 years ago

8 0

Answer:

no unless the variables are known

Step-by-step explanation:

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Work out the surface area of a cylinder when the height = 18cm and the volume = 1715cm cubed

lara [203]

Answer:

813.4 cm² (nearest tenth)

Step-by-step explanation:

Volume of a cylinder

$\sf V=\pi r^2 h \quad\textsf{(where r is the radius and h is the height)}$

Given:

h = 18cm
V = 1715 cm³

Use the Volume of a Cylinder formula and the given values to find the radius of the cylinder:

$\implies \sf 1715=\pi r^2 (18)$

$\implies \sf r^2=\dfrac{1715}{18 \pi}$

$\implies \sf r=\sqrt{\dfrac{1715}{18 \pi}$

Surface Area of a Cylinder

$\sf SA=2 \pi r^2 + 2 \pi r h \quad\textsf{(where r is the radius and h is the height)}$

Substitute the given value of h and the found value of r into the formula and solve for SA:

$\implies \sf SA=2 \pi \left(\sqrt{\dfrac{1715}{18 \pi}\right)^2 + 2 \pi \left(\sqrt{\dfrac{1715}{18 \pi}\right)(18)$

$\implies \sf SA=2 \pi \left(\dfrac{1715}{18 \pi} \right) + 36 \pi \left(\sqrt{\dfrac{1715}{18 \pi}\right)$

$\implies \sf SA=\dfrac{1715}{9} + 36 \pi \left(\sqrt{\dfrac{1715}{18 \pi}\right)$

$\implies \sf SA=813.3908956...$

Therefore, the surface area of the cylinder is 813.4 cm² (nearest tenth)

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2 years ago

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Determine whether Y=-x+6 x+y=20 is parallel, perpendicular or neither

Sever21 [200]

Answer:

Parallel

Step-by-step explanation:

-x+6 slope:-1

X+y=20 slope -1

Hence the answer is parallel

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3 years ago

Hannah decided to make finger gelatin for a huge children’s party. She had to make 8 packs of gelatin. Each pack needed 2 cups o

Nadya [2.5K]

Answer:

4 quarts

Step-by-step explanation:

need 16 cups. In quarts that would be 4 quarts.

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3 years ago

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Find the circumstances of a circle if the area is 300 square centimeter

sergiy2304 [10]

It will be 61 rounded.

Here the link I used

https://www.piday.org/calculators/circle-calc-find-c-d-a-r/#

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3 years ago

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Hey lads could you please check out my channel on you.tube please leave a like and subscribe it would help a lot much love stay

sashaice [31]

Answer:

ok, ill do that ^V^

Step-by-step explanation:

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3 years ago

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