3 years ago

Sandy sold half of her comic books and then brought 6 more.She now has 11.How many did she begin with?

Mathematics

2 answers:

andreyandreev [35.5K]3 years ago

8 0

10. 11 - 6 = 5 x 2 = 10 :)

grigory [225]3 years ago

7 0

10 books is the answer

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elixir [45]

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2 years ago

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barxatty [35]

$z=f(x(u,v),y(u,v)),\begin{cases}x(u,v)=2u+v^2\\y(u,v)=3u-v\end{cases}$

We're given that $f_x(6,1)=3$ and $f_y(6,1)=-1$ , and want to find $\frac{\partial z}{\partial v}(1,2)$ .

By the chain rule, we have

$\dfrac{\partial z}{\partial v}=\dfrac{\partial z}{\partial x}\dfrac{\partial x}{\partial v}+\dfrac{\partial z}{\partial y}\dfrac{\partial y}{\partial v}$

and

$\dfrac{\partial x}{\partial v}=2v$

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Then

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