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2 years ago

5

During summer, when the snow melts, the water level of the Yukon River increases. If the water level of the river increased by 2

8 centimeters in 4 days, what is the water level increase rate in centimeters per day?

1 answer:

Montano1993 [528]2 years ago

3 0

Answer:

7 centimeters per day

Step-by-step explanation:

28 centimeters / 4 days = 7 centimeters per day

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vampirchik [111]

Answer:

$\large\boxed{x=\dfrac{-9\pm\sqrt{41}}{2}}$

Step-by-step explanation:

$\text{The quadratic formula of}$

$ax^2+bx+c=0$

$\text{If}\ b^2-4a0,\ \text{then the equation has two solutions}\ x=\dfrac{-b\pm\sqrt{b^2-4ac}}{2a}\\=========================================$

$\text{We have}\ x^2+9x+10=0\\\\a=1,\ b=9,\ c=10\\\\\text{substitute:}\\\\b^2-4ac=9^2-4(1)(10)=81-40=41>0\qquad _{\text{two solutions}}\\\\\sqrt{b^2-4ac}=\sqrt{41}\\\\x=\dfrac{-9\pm\sqrt{41}}{2(1)}=\dfrac{-9\pm\sqrt{41}}{2}$

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2 years ago

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Vlada [557]

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2 years ago

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OverLord2011 [107]

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Step-by-step explanation:

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Step-by-step explanation:

Hopefully this helps you :3

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