2 years ago

Five times a number is added to two times its square. if the result is 168, find the number

Mathematics

1 answer:

Andreas93 [3]2 years ago

3 0

5x+(2x)^2= 168 now solve this

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What is the radius of a circle with an area of 78.5 cubic inches? Use 3.14 for pi. Enter your answer in the box.

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$\bf \textit{area of a circle}\\\\ A=\pi r^2~~ \begin{cases} r=radius\\[-0.5em] \hrulefill\\ A=78.5 \end{cases}\implies 78.5=\pi r^2\implies \cfrac{78.5}{\pi }=r^2 \\\\\\ \sqrt{\cfrac{78.5}{\pi }}=r\implies 4.9987\approx r$

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WARRIOR [948]

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mamaluj [8]

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3 years ago

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egoroff_w [7]

The answer is for this question would obviously be D.

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