3 years ago

What is the value of x ?

Mathematics

1 answer:

Lostsunrise [7]3 years ago

3 0

Vertical angles are congruent (equal), and the angles below are vertical angles.

x + 40 = 3x

40 = 3x - x

2x = 40

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Jacob sells homemade skateboard decks for a profit of $27 per deck. He is considering switching to a new type of material that w

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3 years ago

Please help and thank you

Black_prince [1.1K]

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3 years ago

After sales tax, a $600 antique clock costs $642. What is the sales tax percentage?

LenKa [72]

well, clearly the tax is the added 42 bucks, so hmmm if we take 600 to be the 100%, how much is 42 off of it in percentage?

$\begin{array}{ccll} amount&\%\\ \cline{1-2} 600 & 100\\ 42& x \end{array} \implies \cfrac{600}{42}=\cfrac{100}{x}\implies \cfrac{100}{7}=\cfrac{100}{x} \\\\\\ 100x=700\implies x=\cfrac{700}{100}\implies x=7$