If $y = (5 x + 1)^{2}$ , find $\frac{d y}{d x}$ when $x = 1$ .

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A box contains 7 red and 6 blue balls. Two balls are taken at random without replacement. Find the probability that they are of different co…
A straight line passes through $(- 2, 5)$ and $(1, 8)$ . Find the value of $y$ when $x = 9$ .
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