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3 years ago

HeLp!!!!!!!!!!!!!!!!!!!!

Mathematics

1 answer:

OLEGan [10]3 years ago

7 0

1. matter is made up of what atoms and molecules are made of, meaning anything made of positively charged protons, neutral neutrons, and negatively charged electrons.

2.Atoms comprise of the nucleus (which contains protons and neutrons) and electrons. Conversely, a molecule comprises of two or more, identical or different atoms, combined chemically.

3. Pure substances cannot be separated into any other kinds of matter, while a mixture is a combination of two or more pure substances.

4. A compound is a pure substance composed of two or more different atoms chemically bonded to one another.

hope this helps!

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The hypotenuse of a right triangle measures 2 sqrt 15 centimeters and its shorter leg measures 2 sqrt 6

ioda

Answer: please see the attachments for the solution.

Step-by-step explanation:

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4 years ago

Um...help please??????

Ket [755]

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Step-by-step explanation:

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3 years ago

Read 2 more answers

Answer and how to do it

ollegr [7]

Answer:

$(x - 9)^2 + y^2 = 36$

Step-by-step explanation:

The equation of a circle in standard form is

$(x - h)^2 + (y - k)^2 = r^2$

You are given

$x^2 + y^2 - 18x + 45 = 0$

In order to put the equation in standard from, we need to complete the square. Since there is no y term, the y part is simply y^2, and there is no need to complete the square for y. For x, we do have an x term, so we must complete the square in x.

Start by grouping the x terms and subtracting 45 from both sides.

$x^2 - 18x + y^2 = -45$

Now we need to complete the square for x.

$x^2 - 18x ~~~~~~+ y^2 = -45$

The number that completes the square will go in the blank above, and it will also be added to the right side of the equation.

To find the number you need to add to complete the square, take the coefficient of the x term. It is -18. Divide it by 2. You get -9. Now square -9 to get 81. The number that completes the square in x is 81. Now you add it to both sides of the equation.

$x^2 - 18x + 81 + y^2 = -45 + 81$

$(x - 9)^2 + y^2 = 36$

Answer: $(x - 9)^2 + y^2 = 36$

6 0

3 years ago

Which of the following best represents a compound?

Ronch [10]

Answer:

The answer to your question is: Salt

Step-by-step explanation:

Element: is a substance that cannot be converted into another substance.

Compound: is a substance that is formed by 2 or more elements.

Mixture: is a substance composed by 2 or more compounds.

Iron it is an element

Salt it is a compound

River sediment it is a mixture

Ocean water it is a mixture

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3 years ago

A 30°–60°–90° triangle has a shorter leg with a length of 3 units.

Lena [83]

The hypotenuse is 6. 30-60-90 triangles have a ration of x, x $\sqrt{3}$ , and 2x, respectively. So since you have the value for the 30º side, then you just double it to get the hypotenuse's value.

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3 years ago