Mathematics: What are the answers for number 6 &

What are the answers for number 6 &

Ответ:

angie249

15.01.2022

$\large\boxed{6.\ 2\left[\begin{array}{ccc}2&3\\1&5\end{array}\right] +\left[\begin{array}{ccc}1&2\\3&4\end{array}\right] =\left[\begin{array}{ccc}5&8\\5&14\end{array}\right] }\\\boxed{7.\ 3^2-4(-2+5)=-3}$

Step-by-step explanation:

$6.\\2\left[\begin{array}{ccc}2&3\\1&5\end{array}\right] +\left[\begin{array}{ccc}1&2\\3&4\end{array}\right] =\left[\begin{array}{ccc}2\cdot2&2\cdot3\\2\cdot1&2\cdot5\end{array}\right] +\left[\begin{array}{ccc}1&2\\3&4\end{array}\right]\\\\=\left[\begin{array}{ccc}4&6\\2&10\end{array}\right] +\left[\begin{array}{ccc}1&2\\3&4\end{array}\right]=\left[\begin{array}{ccc}4+1&6+2\\2+3&10+4\end{array}\right] \\\\=\left[\begin{array}{ccc}5&8\\5&14\end{array}\right]$

$7.\\3^2-4(-2+5)\qquad\text{use PEMDAS}\\\\=9-4(3)\\\\=9-12\\\\=-3$

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Ответ:

sl1010

28.04.2023

Mathematics

22.1 grams

Step-by-step explanation:

At the end of each minute, (1 -17.1%) = 82.9% of the element remains. At the end of 19 minutes, the quantity has been multiplied by that value 19 times, so the remaining amount is ...

(780 g)(0.829^19) ≈ 22.1 g

After 19 minutes 22.1 grams remain.

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What are the answers for number 6 &

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