3 years ago

Solve for r. r/5 = -9

Mathematics

2 answers:

frosja888 [35]3 years ago

7 0

Answer:

r = -45

Step-by-step explanation:

in order to get r by itself you must multiply both sides by 5. afterwards you should get -45 because 5 * -9 = -45

harkovskaia [24]3 years ago

4 0

R=-45 because you multiply both sides by 5

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Step 1: Convert $\frac{5\pi }{12}$ , which is in radians into degrees. To convert it multiply by $\frac{180}{\pi }$

$\frac{5\pi }{12} =\frac{180}{\pi }$

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Step 2: 75 degrees isn't on the unit circle but 45 degrees and 30 degrees is. Since 45 + 30 = 75 you can use the cosine of 45 and 30 to find the exact value

cos45 = $\frac{\sqrt{2} }{2}$

cos30 = $\frac{\sqrt{3} }{2}$

Step 3: Add the cos45 and cos30 to get cos5pi/12

$\frac{\sqrt{2} }{2} +\frac{\sqrt{3} }{2} = \frac{\sqrt{2}+\sqrt{3}}{2}$

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