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svetlana [45]
3 years ago
8

Find the total surface area of a rectangular prism whose width is 8 inches, length is 12 inches and height is 5 inches. Please s

ketch and show work explain I really need your help. URGENTLY PLZ HELP.

Mathematics
1 answer:
Tamiku [17]3 years ago
3 0
The total surface area is going to be the area of all sides added together.
In a rectangular prism there are six sides but the good news is they come in pairs meaning you only have to find the area of three sides.
To find the area of a side multiply its side lengths by each other.
After you found the area of three sides multiply each one by 2.
Then take the three numbers you get from that, add em all up, and there’s your answer!!
Hope this helped.

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I really need to know how long it takes the large pipe on its own
Andreyy89

s = hours it takes the small pipe on its own.


L = hours it takes the large pipe on its own.


we know the small pipe can do it in 11 hours total, so s = 11, so, how much of the whole job has the small done in 1 hour only?


well, if it takes 11 hours to do the whole thing, in 1 hour it has done only 1/11 of the whole job.


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in that 1 hour, how much has the large one done? well, it has only done 1/L of the job.


\bf \stackrel{\textit{how much has it been done by both in 1 hour}}{\stackrel{\stackrel{small}{rate}}{\cfrac{1}{s}}+\stackrel{\stackrel{large}{rate}}{\cfrac{1}{L}}~~=~~\stackrel{job}{\cfrac{1}{6}}} \\\\\\ \cfrac{1}{11}+\cfrac{1}{L}=\cfrac{1}{6}\implies \stackrel{\textit{multiplying both sides by }\stackrel{LCD}{66L}}{6L+66=11L}\implies 66=5L \\\\\\ \cfrac{66}{5}=L\implies 13\frac{1}{5}=L\impliedby \textit{13 hours and 12 minutes}


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