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3 years ago

Plz help question in the picture help me plz

Mathematics

2 answers:

Aliun [14]3 years ago

4 0

The answer is true, true, true!!

Nina [5.8K]3 years ago

3 0

Answer:

true, false, true

Step-by-step explanation:

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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

PLZ HELP!!!!!!!!!!!!!!

Mashutka [201]

The answer would be B

7 0

3 years ago

I will literally pay you pls help me :(

vovikov84 [41]

The answer is 35

Since they are supplementary they both equal 180 degrees.

(3x+10)+(2x-5)=180

Add them up

5x-5=180

Subtract 5 from both sides

5x=180-5

5x=175

Divide 5 from both sides

x=35.

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3 years ago

Francesco wants to figure out how many ounces in his tub of protein powder. His friend ordered a tub that was 48 ounces. Frances

lana66690 [7]

His friend tub was 48 ounces and Francisco was .75 of 48. So, 48x 0.75 = 38.6

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3 years ago

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Please help me please please please

Andrei [34K]

Answer:wanna hang

Step-by-step explanation:

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