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3 years ago

Please I need help!! Please anyone that sees this could you please help me. I don't understand it.

Mathematics

1 answer:

navik [9.2K]3 years ago

8 0

9514 1404 393

Answer:

M = (0, 0), which IS the origin

Step-by-step explanation:

The midpoint is given by the formula ...

M = (A + B)/2

M = ((4, -6) +(-4, 6))/2 = (4-4, -6+6)/2 = (0, 0)/2

M = (0, 0) . . . . . IS the origin

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A cylinder has diameter of 4ft and a height of 9ft. Explain whether halving the diameter has the same effect on the surface area

elena55 [62]

Answer:

See Below

Step-by-step explanation:

The surface area of cylinder is given by the formula:

$SA=2\pi r^2 + 2\pi r h$

Where

r is radius ( diameter is 4, so radius is 4/2 = 2)

h is height ( h = 9)

Lets find original surface are:

$SA=2\pi r^2 + 2\pi r h\\SA=2\pi (2)^2 + 2\pi (2) (9)\\SA=8\pi +36\pi\\SA=44\pi$

<u>Halving diameter:</u>

diameter would be 4/2 = 2, so radius would be 2/2 = 1

So, SA would be:

$SA=2\pi r^2 + 2\pi r h\\SA=2\pi (1)^2 + 2\pi (1) (9)\\SA=2\pi +18\pi\\SA=20\pi$

<u>Halving height:</u>

Height is 9, halving would make it 9/2 = 4.5

Now, calculating new SA:

$SA=2\pi r^2 + 2\pi r h\\SA=2\pi (2)^2 + 2\pi (2) (4.5)\\SA=8\pi + 18\pi\\SA= 26\pi$

Original SA is $44\pi$ ,

Halving diameter makes it $20\pi$

Halving height makes it $26\pi$

So, halving diameter does not have same effect as halving height.

5 0

3 years ago

Twice a number m minus three equals the sum of m and five

Leya [2.2K]

2m - 3 = m + 5

m = 8

2(8) - 3 = 13

(8) + 5 = 13

m = 8

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3 years ago

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amm1812

The answer is b , because 2/3 has more numbers in its decimal than the others

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3 years ago

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Answer:

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Step-by-step explanation:

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Viktor [21]

C is the answer to this

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