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4 years ago

Twice a number is equal to negative four. Which equation could be used to find the number?

Mathematics

1 answer:

ollegr [7]4 years ago

4 0

Answer:

2n = -4

Step-by-step explanation:

This is because the N is unknown and in the way it's written it means 2 times something is -4

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The answer is D) 180miles/6gallons

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How do you solve? using either factoring, completing the square, or quadratic formula?

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X=sq root of 11; x=-sq root of 11

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How much change will you get back from a quarter if you buy 2 ten-cent candies?

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E. 1 nickel

Step-by-step explanation:

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Optimization Calculus Problem

frosja888 [35]

$\bf \begin{cases}
V_c=\textit{cylinder's volume}\\
V_h=\textit{hemisphere's volume}\\
A_c=\textit{area of the cylinder}\\
A_h=\textit{area of the hemisphere}
\end{cases}
\\\\\\
V_c+V_h=6000\implies (\pi r^2h)+\left( \frac{2\pi r^3}{3} \right)
\\\\\\
6000=\cfrac{3\pi r^2h+2\pi r^3}{3}\implies 18000-2\pi r^3=3\pi r^2h
\\\\\\
\boxed{\cfrac{6000}{\pi r^2}-\cfrac{2r}{3}=h}
\\\\
-------------------------------\\\\$

$\bf A_c=2\pi rh+2\pi r^2\implies A_c=2\pi r\left(\cfrac{6000}{\pi r^2}-\cfrac{2r}{3} \right)+2\pi r^2
\\\\\\
A_c=\cfrac{12000}{r}-\cfrac{4\pi r^2}{3}\impliedby \textit{say it has a cost of 1, so stays the same}\\\\
-------------------------------\\\\
A_h=2\pi r^2\impliedby \textit{has a cost of 8 times the cylinder's}
\\\\\\
A_h=16\pi r^2\\\\
-------------------------------\\\\$

$\bf \textit{total cost is }A_c+A_h
\\\\\\
\cfrac{12000}{r}-\cfrac{4\pi r^2}{3}+16\pi r^2\implies \cfrac{12000}{r}-\cfrac{4\pi r^2}{3}+\cfrac{48\pi r^2}{3}
\\\\\\
\boxed{C(r)=\cfrac{12000}{r}+\cfrac{44\pi r^2}{3}}$

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3 years ago

Select all irrational numbers. √9 √12 √16 √20 √25

MaRussiya [10]

I hope this helps you

square root of 9=3 rational number

square root of 16=4 rational number

square root of 25=5 rational number

square root of 12=2 square root of 3 irrational

square root of 20=2 square root of 5 irrational

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3 years ago

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​Twice a number is equal to negative four. Which equation could be used to find the number?

Twice a number is equal to negative four. Which equation could be used to find the number?