3 years ago

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Mathematics

1 answer:

Gnoma [55]3 years ago

4 0

Answer:

x=4

Step-by-step explanation:

DE+EF=DF

(x-1)+(3x+3)=(5x-2)

x-1+3x+3=5x-2

4x+2=5x-2

-x=-4

x=4

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Answer:

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Step-by-step explanation:

Given the expression

$A=\frac{k}{2}\left(m+n\right)$

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$A=\frac{k}{2}\left(m+n\right)$

Flip the equation

$\frac{k}{2}\left(m+n\right)=A$

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$\frac{1}{2}km+\frac{1}{2}kn=A$

Add (-1)/2 × kn to both sides

$\frac{1}{2}km+\frac{1}{2}kn+\left(-\frac{1}{2}kn\right)=\left(-\frac{1}{2}kn\right)+A$

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$\frac{\frac{1}{2}km}{\frac{k}{2}}=\frac{-\frac{1}{2}kn+A}{\frac{k}{2}}$

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Therefore,

$m=\frac{2A-kn}{k}$

Hence, option C is true.

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3 years ago

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Step-by-step explanation:

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Step-by-step explanation:

65-8x>9

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2 years ago

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