3 years ago

Order of operations

Mathematics

2 answers:

lorasvet [3.4K]3 years ago

7 0

PEMDAS

12*(3/4) comes first

8+9=17

zheka24 [161]3 years ago

3 0

You have to tines 12 and 3/4 then add 8

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The formula of the volume of a cylinder:

$V=\pi r^2H\\\\where:\\\\r-a\ radius\\H-a\ height\\\pi r^2-an\ area\ of\ base$

We have:

$V=900\ liters\\1L=1dm^3\ therefore\ V=900L=900dm^3$

and

$H=20\ dm$

substitute:

$\pi r^2\cdot20=900\ \ \ |:20\\\\\pi r^2=45\ dm^2$

Answer: The area of a base of the cylinder is equal 45 dm².

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