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Evgesh-ka [11]
4 years ago
12

Rewrite in simplest terms: 4(-3f-4)-9f

Mathematics
2 answers:
marta [7]4 years ago
8 0

Answer:

-21f-16 I believe but tell me if I'm wrong

Firlakuza [10]4 years ago
6 0

Answer:

-21f-16

Step-by-step explanation:

4(-3f-4)-9f

-12f-16

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one mechanic can do a certain job in 4 days, a second mechanic in 6 days, and a third in 8 days. in what time can the three toge
Phantasy [73]
Now the first mechanic takes 4 days to do the job, so after he has worked for 1 day only, he has done 1/4 of the whole thing.

the second mechanic can do it in 6 days, so after 1 day only of work, he has done 1/6 of the whole thing.

the third mechanic can do it in 8 days, so after a day, he has done 1/8 of the total work.

now, if they all three work together, after 1 hour has gone by, the first mechanic has done 1/4 of the whole thing, the second mechanic has done 1/6 of it, and the last one, has done 1/8.

let's say it took all three working together "t" days, that means after 1 hour of work, they all combined have done 1/t of the whole thing, thus

\bf \stackrel{first~mechanic}{\cfrac{1}{4}}~+~\stackrel{second~mechanic}{\cfrac{1}{6}}~+~\stackrel{third~mechanic}{\cfrac{1}{8}}~=~\stackrel{total~work}{\cfrac{1}{t}}\\\\
-------------------------------\\\\
\textit{let's use our LCD of 24 on the left-hand-side}
\\\\\\
\cfrac{6~+~4~+~3}{24}=\cfrac{1}{t}\implies \cfrac{13}{24}=\cfrac{1}{t}\implies t=\cfrac{24}{13}\implies \stackrel{\textit{1day, 20hrs, 18mins}}{t=1\frac{11}{13}}
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Answer:

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Step-by-step explanation:

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