Find the surface area for a sphere with a radius of 10 feet. Round to the nearest whole number.
1,256 ft2
4,189 ft2
1,089 ft2
1,568 ft2
Find the volume of a sphere with a radius of 10 feet. Round to the nearest whole number. 1,257 ft3
4,187 ft3
1,089 ft3
1,568 ft3
Find the surface area for a sphere with a radius of 7 cm. Round to the nearest whole number.
307 cm2
1,436 cm2
1,020 cm2
615 cm2

- anonymous

- chestercat

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- anonymous

@qweqwe123123123123111

- anonymous

A = 4πr²
V = 4/3 πr³

- anonymous

is that too the first question??

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## More answers

- anonymous

hey my friend says your really smart qwe

- anonymous

They're the answers to all 3 of your questions.

- anonymous

I'm not smart.
I have google. :-)

- anonymous

1256 is step a for question 1

- anonymous

1256 is the answer to question 1.

- anonymous

thats what i thought cause i did v and i was all liek wait what!!!

- anonymous

Yes...volume will be somewhat larger... :-)

- anonymous

i meant 3rd questions answer is 615.44

- anonymous

Yes, 615 is question 3. :-)

- anonymous

and on volume does he mean 1/3?

- ryan123345

Area of Sphere Formula

- anonymous

No. He means 4/3 (same as 1.33333.....)
v = 4/3 pi r^3

- ryan123345

\[A = \frac{ 4 }{ \pi r^2 }\]

- ryan123345

so for the last one your equation would be.

- anonymous

is it c?

- ryan123345

\[\frac{ 4 }{ \pi(49) }\]

- anonymous

C? No.

- anonymous

What's pi * r^3 ?

- anonymous

You still here?

- anonymous

3140 sorry i wasnt there

- anonymous

- anonymous

Hi there! You mentioned me; what can I help you with? I'm not sure which question you're looking at. :)

- anonymous

the middle one

- anonymous

Are you still trying to figure out the answer to #3?

- anonymous

.... Hello? @niall1Dawesome You there?

- anonymous

sorry my computer was lagging really bad

- anonymous

no number 2 i already know 1 and 3

- anonymous

- anonymous

Okay. I'm taking a look at this right now. :)

- anonymous

Eureka! I have the answer. :) Do you know the formula to calculate this?

- anonymous

okay and hey you changed your icon cool

- anonymous

Ha ha, yeah. :) I felt like switching it up a bit.
So do you know the formula to calculate this?

- anonymous

Are you still experiencing lag?

- anonymous

a little

- anonymous

and well isnt the formula V = 4/3 πr³

- anonymous

Okay, I think you are still experiencing a little lag. No worries, I can still help you with this. Hopefully when you see it, you'll get it! :) Perfect formula! :)

- anonymous

ya your post jsut showed up

- anonymous

So let's plug in the values from your problem:
\[v = 4/3 * \pi * 10^3\]
\[v = 4/3 * \pi * 1,000\]
When you plug this all in (you can do it on a calculator), you'll find that 4/3 = 1.3.
so:
\[v = 1.3 * 3.14 * 1,000\]
And then you'll get your answer. :)

- anonymous

ok i will do that

- anonymous

4082

- anonymous

Sorry; my mistake. You should have rounded 1.3 and input 1.4 (since 1.3333333... is irrational) and you would have gotten 4,187 :)

- anonymous

oh lol

- anonymous

XD Hey, everyone makes mistakes... ugh... can't say that without thinking of Hannah Montana...

- anonymous

hey can you check my answer to a question like this

- anonymous

yes I sure can! :)

- anonymous

Find the volume for a sphere with a radius of 7 cm. Round to the nearest whole number.
307 cm2
1,436 cm2
1,020 cm2
615 cm2
im pretty sure its b but im going to redo the math

- anonymous

hehe hannah montana lol

- anonymous

yea i think it is b

- anonymous

You are absolutely correct. :)

- anonymous

yay lol thx for helping me

- anonymous

You're welcome! :D

- anonymous

:) everybody makes mistakes everybody has those days 1 2 3 4 lol i had too

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