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mylen [45]
2 years ago
15

Can someone help me with this? thank you!

Mathematics
1 answer:
Vedmedyk [2.9K]2 years ago
8 0

Answer:

V = 240 cm^{3}

Step-by-step explanation:

To find the volume of a rectangular prism use this equation:

V = l*w*h

l = length (20 cm)

w = width (4 cm)

h = height (3 cm)

Plug all these values into the equation and solve:

V = (20 cm)(4 cm)(3 cm)

V = (80 cm^{2})(3 cm)

V = 240 cm^{3}

Therefore, the volume of the rectangular prism is 240 cm^{3}.

I hope this helps! Good luck!

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Isabella buys a computer that is on sale for 30% off the original price. The original price is $216 more than the sale price.
kakasveta [241]

Answer:

720

Step-by-step explanation:

<em>Set the problem up as a proportion</em>

<em />\frac{216}{x}= \frac{30}{100}<em />

<em>cross multiply</em>

<em />21600=30x<em />

<em>divide both sides by 30</em>

<em />720=x<em />

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zavuch27 [327]
If the length is X

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We know that \overline{x}=8 so:

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We want to calculate:

\sum\limits_{k=1}^7\,\big(2x_k-3\big)^2=\sum\limits_{k=1}^7\,\big(4x_k^2-12x_k+9\big)=\\\\\\=\sum\limits_{k=1}^7\,4x_k^2-\sum\limits_{k=1}^7\,\big12x_k+\sum\limits_{k=1}^7\,9=4\sum\limits_{k=1}^7\,x_k^2-12\sum\limits_{k=1}^7\,x_k+\sum\limits_{k=1}^7\,9=\\\\\\=4\cdot672-12\cdot56+7\cdot9=2688-672+63=\boxed{2079}

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zavuch27 [327]
Because supplementary angles means mA + mB = 180.
Then subtract 80 from 180 which will get you 100.
So B = 100
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