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polet [3.4K]
3 years ago
12

3х + 5(1 +7x) = 3х – 30

Mathematics
2 answers:
weqwewe [10]3 years ago
4 0
3x + (5+35x) = 3x -30
38x + 5 = 3x -30
38x = 3x -35
35x = -35
x = -1
satela [25.4K]3 years ago
4 0

Answer:-1

Step-by-step explanation:

3x+5(1+7x)=3x-30

Open bracket

3x+5+35x=3x-302

Collect like terms

3x+35x-3x=-30-5

35x=-35

Divide both sides by 35

35x÷35=-35÷35

X=-1

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Answer: Level of the liquid dropping at 28.28 inch/second when the liquid is 2 inches deep.

Step-by-step explanation:

Since we have given that

Height = 9 inches

Diameter = 6 inches

Radius = 3 inches

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Volume of cone is given by

V=\dfrac{1}{3}\pi r^2h\\\\V=\dfrac{1}{3}\pi \dfrac{1}{9}h^2\times h\\\\V=\dfrac{1}{27}\pi h^3

By differentiating with respect to time t, we get that

\dfrac{dv}{dt}=\dfrac{1}{27}\pi \times 3\times h^2\dfrac{dh}{dt}=\dfrac{1}{9}\pi h^2\dfrac{dh}{dt}

Now,  the liquid drips out the bottom of the filter at the constant rate of 4 cubic inches per second, ie \dfrac{dv}{dt}=-4\ in^3

and h = 2 inches deep.

-4=\dfrac{1}{9}\times \pi\times (2)^2\dfrac{dh}{dt}\\\\-9\pi =\dfrac{dh}{dt}\\\\-28.28=\dfrac{dh}{dt}

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7 0
3 years ago
Simplify ½of(3/5-1/4)​
liq [111]

Answer:

\frac{7}{40}

6 0
2 years ago
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How I can solve this
gavmur [86]

Answer:

\boxed{\textrm{B)}\qquad y>4}.

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We start by subtracting 1 from both sides of the second inequality:

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Hope this helps!!

/////////////////////////////////////////////////////////////////////////////////////////////////////////////

5 0
3 years ago
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