2 years ago

10 POINTS! Perform the indicated operation: 2 3/4 - 1/3 =

Mathematics

2 answers:

Mrrafil [7]2 years ago

5 0

I think it's right......

MA_775_DIABLO [31]2 years ago

4 0

Answer: it is 2 5/12 its easy just add

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A steel pipe 100 cm long has an outside diameter of 2 cm and an inside diameter of 1.8 cm. If thee density of the steel is 7.8 g

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Answer:

The mass of the pipe is $465\ g$

Step-by-step explanation:

step 1

Find the volume of the steel pipe

The volume is equal to the area of outside circle minus the area of inside circle, multiplied by the length of the pipe

$V=\pi [r2^{2}-r1^{2}]L$

we have

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$\pi=3.14$

substitute

$V=(3.14)[1^{2}-0.9^{2}](100)=59.66\ cm^{3}$

step 2

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$m=7.8(59.66)=465\ g$

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