Multiply 12 times 3/8 simplify the answer and express it as a mixed number

Mathematics

2 answers:

lidiya [134]3 years ago

4 0

Answe

12× $\frac{3}{8}$ =4 $\frac{1}{2}$

Step-by-step explanation:

Tatiana [17]3 years ago

3 0

12 x (3 / 8)

9 / 2 <= improper form

$4\frac{1}{2}$ <= mixed form

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Evaluate the cosine if the angle of rotation which contains the point (9, -3) on its terminal side

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so we know the terminal point is at (9, -3), now, let's notice that's the IV Quadrant

$\bf (\stackrel{x}{9}~~,~~\stackrel{y}{-3})\impliedby \textit{let's find the \underline{hypotenuse}} \\\\\\ \textit{using the pythagorean theorem} \\\\ c^2=a^2+b^2\implies c=\sqrt{a^2+b^2} \qquad \begin{cases} c=hypotenuse\\ a=adjacent\\ b=opposite\\ \end{cases} \\\\\\ c=\sqrt{9^2+(-3)^2}\implies c=\sqrt{81+9}\implies c=\sqrt{90} \\\\[-0.35em] ~\dotfill$

$\bf cos(\theta )=\cfrac{\stackrel{adjacent}{9}}{\stackrel{hypotenuse}{\sqrt{90}}}\implies \stackrel{\textit{rationalizing the denominator}}{\cfrac{9}{\sqrt{90}}\cdot \cfrac{\sqrt{90}}{\sqrt{90}}\implies \cfrac{9\sqrt{90}}{90}}\implies \cfrac{\sqrt{90}}{10}\implies \cfrac{3\sqrt{10}}{10}$