2 years ago

In the picture below, which lines are lines of symmetry for the figure?

Mathematics

1 answer:

harkovskaia [24]2 years ago

3 0

A line of symmetry would separate a shape to make multiple shapes that are exactly the same.

The answer is C.2

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What is the second term in the binomial expansion of (2r-3s)12?

Reptile [31]

$(a+b)^n=\displaystyle\sum_{k=0}^n\binom nka^{n-k}b^k$

where $\dbinom nk=\dfrac{n!}{k!(n-k)!}$ . The second term of the expansion occurs when $k=1$ .

So the second term of the expansion of $(2r-3s)^{12}$ is

$\dbinom{12}1(2r)^{12-1}(-3s)^1=12(2r)^{11}(-3s)=-73728r^{11}s$