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Luda [366]
3 years ago
8

Which best describes a compound such as magnesium oxide

Mathematics
1 answer:
vfiekz [6]3 years ago
4 0

Answer:

D. a pure substance that is made up of different elements

Step-by-step explanation:

There are two types of pure substances: elements and compounds.

Elements are made up of only one type of atom. And compounds are pure substances, that are made up of more than one type of element. Like - magnesium oxide. It is a compound of a metal with a non-metal and is held together with ionic bonds.

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In elimination method you add/subtract both equations to cancel out a variable so you can solve for 1 variable.

since there is +y in the first equation and +y in the second equation, you can subtract both equations from eachother to only be left with x values:

  (2x+y=11)            (subtract each term)
- (x+y=9)

you get x=2.

now sub in x=2 to any of the 2 equations to find what y is.

2(2)+y=11
y=7

so the answer is (2,7) which means the 2 lines intersect at the point (2,7)

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4 years ago
What value of g makes the equation tue (x+7)(x-4)=x^ 2+gx-28
Pie

Answer:

\huge\boxed{g=3}

Step-by-step explanation:

(x+7)(x-4)=x^2+gx-28\\\\\text{Use}\ FOIL:\ (a+b)(c+d)=ac+ad+bc+bd\\\\(x+7)(x-4)=(x)(x)+(x)(-4)+(7)(x)+(7)(-4)\\\\=x^2-4x+7x-28=x^2+3x-28\\\\x^2+3x-28=x^2+gx-28\\\\\begin{array}{ccc}x^2&3x&-28\\\downarrow&\downarrow&\downarrow\\x^2&gx&-28\end{array}\Rightarrow g=3

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Answer:

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Step-by-step explanation:

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