3 years ago

Write 3 to the 9th power as an expression

Mathematics

2 answers:

telo118 [61]3 years ago

6 0

3^9
3x3x3x3x3x3x3x3x3
9x3
27x3
81x3
243x3
729x3
2187x3
6561x3
3 to the 9th power is 19683

Anna [14]3 years ago

5 0

3 x 3 x 3 x 3 x 3 x 3 x 3 x 3 x 3 is your answer

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2 years ago

Please teach me on how to answer this question. (addmath question)

arsen [322]

We know that $\overline{x}=8$ so:

$\overline{x}=8\\\\\\\dfrac{\sum\limits_{k=1}^7\,x_k}{7}=8\qquad|\cdot7\\\\\\ \boxed{\sum\limits_{k=1}^7\,x_k=56}$

We want to calculate:

$\sum\limits_{k=1}^7\,\big(2x_k-3\big)^2=\sum\limits_{k=1}^7\,\big(4x_k^2-12x_k+9\big)=\\\\\\=\sum\limits_{k=1}^7\,4x_k^2-\sum\limits_{k=1}^7\,\big12x_k+\sum\limits_{k=1}^7\,9=4\sum\limits_{k=1}^7\,x_k^2-12\sum\limits_{k=1}^7\,x_k+\sum\limits_{k=1}^7\,9=\\\\\\=4\cdot672-12\cdot56+7\cdot9=2688-672+63=\boxed{2079}$