4 years ago

What is the

Mathematics

1 answer:

olya-2409 [2.1K]4 years ago

7 0

Answer:

joe mamma!!!

Step-by-step explanation:

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Help me please this will help my grade !

saul85 [17]

Answer:

so your answer is C

Step-by-step explanation:

Pi is an irrational number---you can't write it down as a non-infinite decimal. This means you need an approximate value for Pi. The simplest approximation for Pi is just 3

5 0

3 years ago

im just bored this is a very easy question so i got like nothing to do rn 2+3+8= first one get brianiliest

pav-90 [236]

Answer:

Step-by-step explanation:

6 0

3 years ago

Read 2 more answers

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:

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