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Aloiza [94]
3 years ago
9

Writing during a thurdestorm yesterday. 600 millimeters of rain fell in 30 minutes ?

Mathematics
1 answer:
defon3 years ago
5 0
600/30= 20
20 millimeters×30 minutes= 600 millimeters
Unit rate= 20 millimeters per minute
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Find all complex solutions of 3x^2+2x+5=0 . (If there is more than one solution, separate them with commas.)
barxatty [35]

Answer:

\large\boxed{-\dfrac{1}{3}-\dfrac{\sqrt{14}}{3}i,\ -\dfrac{1}{3}+\dfrac{\sqrt{14}}{3}i}

Step-by-step explanation:

Use

ax^2+bx+c=0\\\\x=\dfrac{-b\pm\sqrt{b^2-4ac}}{2a}

3x^2+2x+5=0\\\\a=3,\ b=2,\ c=5\\\\b^2-4ac=2^2-4(3)(5)=4-60=-56\\\\\sqrt{b^2-4ac}=\sqrt{-56}=\sqrt{(4)(-14)}=\sqrt4\cdot\sqrt{-14}=2\sqrt{-14}

Use

i=\sqrt{-1}

\sqrt{-14}=\sqrt{(-1)(14)}=\sqrt{-1}\cdot\sqrt{14}=i\sqrt{14}

Therefore:

x=\dfrac{-2\pm 2i\sqrt{14}}{2(3)}=-\dfrac{2}{6}\pm\dfrac{2i\sqrt{14}}{6}=-\dfrac{1}{3}\pm \dfrac{\sqrt{14}}{3}i

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3 years ago
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DerKrebs [107]

Answer:

Step-by-step explanation:

If Jason travel 24 miles in 1/2 hour, he will travel 2*24=2*1/2h

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or

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