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Mathematics 7 Online
hardlyhuman:

Geometry help please!

hardlyhuman:

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hardlyhuman:

@Shadow

563blackghost:

You are solving proportions in a triangle. \(\large\bf{\frac{25}{15} = \frac{7x-40}{18}}\) You need to set it up. So cross multiply. \(\large\bf{25 \times 18= 15 \times(7x-40)}\) Simplify to find `x`.

hardlyhuman:

Okay, thank you.

563blackghost:

np

hardlyhuman:

Could you help me with another?

563blackghost:

sure

hardlyhuman:

Thank you.

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gabethebabe:

1.23 x 10^6

gabethebabe:

meters

hardlyhuman:

Yea I did that and I got 1230000

gabethebabe:

yup

563blackghost:

For volume of a square pyramind you use this formula: \(\large\bf{V=\frac{1}{3} a^{2} h}\) Plug the side and height. \(\large\bf{V=\frac{1}{3} 183^{2}(110)}\)

hardlyhuman:

The answer is 110?

563blackghost:

The answer you got is correct. I was just expressing the equation you would use, cause i can't give direct answers >.>

hardlyhuman:

Oh okay, so I enter what I got

gabethebabe:

why not

563blackghost:

yes u do @hardlyhuman

hardlyhuman:

Okay great, if you're able to could you help me with the rest @563blackghost ?

563blackghost:

sure, but i might have to go in a bit

hardlyhuman:

Okay, thank you :)

hardlyhuman:

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563blackghost:

Volume of a sphere is: \(\large\bf{V=\frac{4}{3} \pi r^{3}}\) To find the radius divide the diameter by 2. \(\large\bf{10 \div 2 = 5}\) Now plug. \(\large\bf{V=\frac{4}{3} \pi ~5^{3}}\)

hardlyhuman:

523.6

563blackghost:

yup

hardlyhuman:

do i have to round it?

563blackghost:

Your answer is already rounded to the nearest tenth.

hardlyhuman:

Oh okay, next question!! XD

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563blackghost:

Use the same formula. \(\large\bf{V=\frac{4}{3} \pi 7.5^{3}}\)

hardlyhuman:

kk

hardlyhuman:

1767.15

563blackghost:

Correct

563blackghost:

Just round to the nearest tenth.

hardlyhuman:

1767.2 ?

563blackghost:

yup

hardlyhuman:

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563blackghost:

No angles are defined to be congruent, we are only told of the sides. This means this triangle will be proven by SSS Similarity Theorem.

hardlyhuman:

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563blackghost:

@Shadow can you help him i have to leave

563blackghost:

him/her* dont want to assume gender >.>

hardlyhuman:

her

hardlyhuman:

dont really care though lol

Shadow:

Offended

hardlyhuman:

whats to be offended about? :P

Shadow:

Wrong gender lol

hardlyhuman:

eh im not so air tight with stuff lol

hardlyhuman:

ive been called worse than the wrong gender XD so hyd

hardlyhuman:

is this correct?

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Shadow:

That's the one I would go with.

hardlyhuman:

kk, next one?

Shadow:

I have to study for a test, try see if some of the other math helpers are available.

hardlyhuman:

okay, thanks

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