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Korolek [52]
3 years ago
6

I need help with this

Mathematics
1 answer:
vodka [1.7K]3 years ago
5 0

9514 1404 393

Answer:

  • Natural
  • Whole
  • Integer
  • Rational

Step-by-step explanation:

4563 is a positive integer, hence a Natural number. It fits in the innermost oval on the left side of the diagram, so is a member of all enclosing sets:

  • Natural
  • Whole
  • Integer
  • Rational
  • Real
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Brass is made from a mixture of copper and other elements. a mixture that is 80% copper is combined with a mixture that is 60% c
algol [13]

The equation that can be used to find x, the amount of the 60% mixture used to create the 65% mixture is:

0.60*x + 0.80*(100 - x) = 0.65*(100).    

<h3>Which equation we should use?</h3>

First, let's define two variables:

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We know that we want to make 100 lb of 65% copper brass, then we must have that:

x + y = 100

And the percentage of copper before and after mixing must be the same, so we can write:

0.60*x + 0.80*y = 0.65*(x + y).

(where the percentages are written in decimal form).

Then we have a system of equations:

x + y = 100

0.60*x + 0.80*y = 0.65*(x + y).

To get a single equation, we can isolate the variable "y" on the first equation:

y = 100 - x

Now we replace that in the other equation:

0.60*x + 0.80*(100 - x) = 0.65*(100).      

This is what we wanted to get, an equation that can be used to find x, the amount of the 60% mixture used to create the 65% mixture.

If you want to learn more about systems of equations:

brainly.com/question/13729904

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2 years ago
The volume of a cylinder is 770 cm. It's height is 5 cm. Find its approximate radius.
Alinara [238K]

Hey there,

The equation for the volume of a cylinder is V = πr²h.

The first step into finding the radius is to plug in what you already know into the equation:

  • 770 = πr²5

We divide both sides by 5:

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Now we divide both sides by π:

  • 49.0197224723 = r²

Finally we just do the square root of 49.0197224723:

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The radius therefore would be about 7cm.

Hope I helped,

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Answer:

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Answer:

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Step-by-step explanation:

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Step-by-step explanation:

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