3 years ago

Round the following number to the indicated place value.

Mathematics

2 answers:

ankoles [38]3 years ago

4 0

The answer would be A

rusak2 [61]3 years ago

3 0

A is the correct answer

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Answer:

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Step-by-step explanation:

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105+140=245

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3 years ago

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White raven [17]

Answer:

2 cm

Step-by-step explanation:

h = 14 cm

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Step-by-step explanation:

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3 years ago

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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:

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

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2 years ago