How to do this question plz answer me step by step plzz plz please

Mathematics

1 answer:

Alina [70]3 years ago

4 0

Answer:

See the attached

Step-by-step explanation:

The solution and filled in Venn diagram is attached

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72% and 89% confirm that the mean theses two are scores is 80.5%

german

Answer:

correct. the mean of 72 and 89 is 80?5

Step-by-step explanation:

find the mean to confirm it.

(a+b)/2

72+89= 161

161/2=80.5

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In 1975 1000 tons of coal was manufactured. It is 10% greater in 1976 and 5% less in 77. What is the final about of coal in 1977

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In 1975 it was 1000tons, ok, well, in 1976 it went up by 10%, how much is a 10% increase?

$\bf \begin{array}{ccllll}
coal&\%\\
\text{\textemdash\textemdash\textemdash}&\text{\textemdash\textemdash\textemdash}\\
1000&100\\
x&100+10
\end{array}\implies \cfrac{1000}{x}=\cfrac{100}{100+10}\implies \cfrac{1000\cdot 110}{100}=x
\\\\\\
1100=x$

well, in 1976 it was 1100 tons then, and in 1977 it went down by 5% of 1100, well, if we take 1100 to be the 100%, then what is a 5% decrease?

$\bf \begin{array}{ccllll}
coal&\%\\
\text{\textemdash\textemdash\textemdash}&\text{\textemdash\textemdash\textemdash}\\
1100&100\\
x&100-5
\end{array}\implies \cfrac{1100}{x}=\cfrac{100}{100-5}\implies \cfrac{1100\cdot 95}{100}=x$

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I believe it would be 12.16

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14a + 2 =<br> Please help

nika2105 [10]

Answer: ( 2 x 7 ) a + 2

Step-by-step explanation:

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How to do this question plz answer me step by step plzz plz please​

How to do this question plz answer me step by step plzz plz please