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vaieri [72.5K]
3 years ago
9

In a lake, there is a patch of lily pads. Every day, the patch doubles in size. If it takes 48 days for the patch to cover the e

ntire lake, how long would it take for the patch to cover half of the lake?
Mathematics
1 answer:
Ira Lisetskai [31]3 years ago
5 0

Answer:

47 days

Step-by-step explanation:

if the lake doubles its size every day, then

if the whole lake was covered in 48 days,

half the lake was covered the day before,

so, the answer is 47 days

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Use the Chain Rule to find the indicated partial derivatives. z = x^4 + xy^3, x = uv^4 + w^3, y = u + ve^w Find : ∂z/∂u , ∂z/∂v
k0ka [10]

I'll use subscript notation for brevity, i.e. \frac{\partial f}{\partial x}=f_x.

By the chain rule,

z_u=z_xx_u+z_yy_u

z_v=z_xx_v+z_yy_v

z_w=z_xx_w+z_yy_w

We have

z=x^4+xy^3\implies\begin{cases}z_x=4x^3+y^3\\z_y=3xy^2\end{cases}

and

\begin{cases}x=uv^4+w^3\\y=u+ve^w\end{cases}\implies\begin{cases}x_u=v^4\\x_v=4uv^3\\x_w=3w^2\\y_u=1\\y_v=e^w\\y_w=ve^w\end{cases}

When u=1,v=1,w=0, we have

\begin{cases}x(1,1,0)=1\\y(1,1,0)=2\end{cases}\implies\begin{cases}z_x(1,2)=12\\z_y(1,2)=12\end{cases}

and the partial derivatives take on values of

\begin{cases}x_u(1,1,0)=1\\x_v(1,1,0)=4\\x_w(1,1,0)=0\\y_u(1,1,0)=1\\y_v(1,1,0)=1\\y_w(1,1,0)=1\end{cases}

So we end up with

\boxed{\begin{cases}z_u(1,1,0)=24\\z_v(1,1,0)=60\\z_w(1,1,0)=12\end{cases}}

3 0
3 years ago
*square root symbol* y^3 multiplied by *square root symbol* y^3
san4es73 [151]
The product of two radicals is equal to the radicand. The square root deletes itself.

So the result is y^3
8 0
3 years ago
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the temperature at 3:00 pm was 35°F. The temperature had dropped 45 degrees by 9:00 pm. What was the tempeture in degrees fahren
Natali [406]
-10 degrees Fahrenheit
35-45=-10
6 0
3 years ago
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Please select the best answer from the choices provided <br><br> A<br> B<br> C<br> D
larisa86 [58]

Answer:

C

Step-by-step explanation:

6 0
3 years ago
8/2(2+2)=<br><br> A. 16<br> B. 1<br> C. 0<br> D. 10
s2008m [1.1K]

The answer to this problem is 16.

To solve we must follow the order of operations.

8/2 is 4.

2+2 is 4.

So, now we multiply 4(4) and will get 16 as the answer

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4 0
3 years ago
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