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
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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 >.>
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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
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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
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hardlyhuman:
do i have to round it?
563blackghost:
Your answer is already rounded to the nearest tenth.