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3 years ago

A chair for an adult is 20 in. tall and 16 in. wide. A builder

Mathematics

1 answer:

Mashcka [7]3 years ago

3 0

Answer:

4 in. wide

Step-by-step explanation:

20/5=4

4x=16

4x/4=16/4

x=4

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2 years ago

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Step-by-step explanation:

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$\sin(\frac{3\pi}{4}-\beta)=\sin(\frac{3\pi}{4})\cos\beta-\cos\frac{3\pi}{4}\sin\beta\\=\frac{1}{\sqrt{2}}\cos\beta-(-\frac{1}{\sqrt{2}})\sin\beta\\\\=\frac{1}{\sqrt{2}}(\cos\beta +\sin\beta)\\\\\sin^2(\frac{3\pi}{4}-\beta)=\frac{1}{2}\cos\beta +\sin\beta)^2=\frac{1}{2}(\cos^2\beta +\sin^2\beta+2\sin\beta\cos\beta\\=\frac{1}{2}(1+\sin2\beta)=\frac{1}{2}(1-\frac{1}{5}) = \frac{2}{5}\\$

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