3 years ago

Pls give an answer to 7 (-2x+4)=-4x

Mathematics

1 answer:

Leto [7]3 years ago

7 0

2.8

-14x+28=-4x
10x=28
X=2.8

Mark brainliest please

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Brianna has 4 pink bracelets . One third of all her bracelets are pink. How many bracelets does Brianna have?

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4 years ago

<img src="https://tex.z-dn.net/?f=%20%7B2%7D%5E%7Bm%7D%20%20%3D%20n%20" id="TexFormula1" title=" {2}^{m} = n " alt=" {2}^{m} =

sveta [45]

Answer:

$\displaystyle n^3-\frac{1}{n^{2}}$

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<u>Exponents Properties</u>

We need to recall the following properties of exponents:

$(a^x)^y=(a^y)^x=a^{xy}$

$\displaystyle a^{-x}=\frac{1}{a^x}$

We are given the expression:

$2^m=n$

We need to express the following expression in terms of n.

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It's necessary to modify the expression to use the given equivalence.

Recall $8=2^3 \text{ and }4 = 2^2$ . Thus:

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Applying the property:

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Substituting the given expression:

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Or, equivalently:

$\mathbf{\displaystyle 8^m-4^{-m}= n^3-\frac{1}{n^{2}}}$

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