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3 years ago

1/5 of a number is 14. Find the number

Mathematics

1 answer:

zheka24 [161]3 years ago

6 0

We set up a proportion: 14/?= 1/5

Cross multiply: 1*?= 14*5
⇒ ?= 14*5/1= 70

1/5 of 70 is 14.

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Rewrite 9cos 4x in terms of cos x.

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$\bf \qquad \textit{Quad identities}\\\\
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\begin{cases}
8sin(\theta )cos^3(\theta )-4sin(\theta )cos(\theta )\\
4sin(\theta )cos(\theta )-8sin^3(\theta )cos(\theta )
\end{cases}
\\\\\\
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