this has completely stumped me | Mathematics | Page 1

feral smelt Jan 31, 2023, 6:18 PM

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8.6*10^4 is 86000.
The largest number that would round to that should be 86499, as 86500 would round to 8.7*10^4.

wispy tartan Jan 31, 2023, 6:18 PM

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OKAY THANKSSSS

wispy tartan Jan 31, 2023, 6:35 PM

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dont underayand this @feral smelt

feral smelt Jan 31, 2023, 6:37 PM

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wispy tartan dont underayand this <@290136354233384960>

Well, if 1 t = 10^6 g, then 8.18 t = 8.18*10^6 g. So, just convert that to an ordinary number.

wispy tartan Jan 31, 2023, 6:38 PM

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SMH, i did that before for another mumkber and it was wrong

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donezo thankss

feral smelt Jan 31, 2023, 6:43 PM

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You're welcome!

wispy tartan Jan 31, 2023, 7:13 PM

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feral smelt You're welcome!

mad stuck

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im getting better, this is the last question, the other ones i got right

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@feral smelt

feral smelt Jan 31, 2023, 7:14 PM

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We are given the length of a circle and we need to find the radius.

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Do you remember the formula for the length of a circle?

wispy tartan Jan 31, 2023, 7:14 PM

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isnt it

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c=pi x radius ^2

feral smelt Jan 31, 2023, 7:15 PM

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No, that's the area.

wispy tartan Jan 31, 2023, 7:15 PM

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o

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uhh

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pi x d

feral smelt Jan 31, 2023, 7:15 PM

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Yes. Though, considering we need the radius, better to express it in terms of r:
L = 2πr

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So, now express r from that.

wispy tartan Jan 31, 2023, 7:16 PM

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C = π d

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OK THX

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2pi24

feral smelt Jan 31, 2023, 7:16 PM

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No, wait.

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We know L and we need r.

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So, express r from L = 2πr and then substitute L = 24 m.

wispy tartan Jan 31, 2023, 7:17 PM

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AAAAAAAAAAAAAAAAA im confused

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im not good with pi

feral smelt Jan 31, 2023, 7:17 PM

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Well, it's just a constant.

wispy tartan Jan 31, 2023, 7:17 PM

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OH WAIT

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12

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12

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12

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12

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12

feral smelt Jan 31, 2023, 7:17 PM

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Um...

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What?

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Why are you writing 12 over and over?

wispy tartan Jan 31, 2023, 7:17 PM

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nevermind

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i did it wrong again

feral smelt Jan 31, 2023, 7:18 PM

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Well, let's correct it.
As I said, express r from L = 2πr first.

wispy tartan Jan 31, 2023, 7:18 PM

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ugh why cant i jsut do maths

feral smelt Jan 31, 2023, 7:19 PM

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You just need some training.

wispy tartan Jan 31, 2023, 7:19 PM

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c = 29
29 = 2 pi r
29/2r
=4.61 to 1dp = 4.6

feral smelt Jan 31, 2023, 7:19 PM

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No, wait.

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Don't substitute numbers yet.

wispy tartan Jan 31, 2023, 7:20 PM

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the 24 chcnaged btw

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cuz i got the question wrong

feral smelt Jan 31, 2023, 7:20 PM

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You have the formula connecting the length and radius: L = 2πr.
You know the length and need the radius. So, express r from that formula.

wispy tartan Jan 31, 2023, 7:20 PM

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oki dokes

feral smelt Jan 31, 2023, 7:21 PM

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Well, what did you get?

wispy tartan Jan 31, 2023, 7:24 PM

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4.61 woooop

feral smelt Jan 31, 2023, 7:24 PM

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What did I just say...

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Don't substitute the numbers!

#this has completely stumped me