Evauate 15 divide by r minus 1 when r = 5

Mathematics

2 answers:

kiruha [24]3 years ago

8 0

The Answer is 2 because 15 divided by r (5) is 3 and 3 minus 1 is 2

Alik [6]3 years ago

4 0

15 divided by 5 equals 3

3 minus 1 equals 2

so your answer would be 2 :)

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Work Shown:

$c^2 = a^2 + b^2 - 2*a*b*\cos(C)\\\\10^2 = 5^2 + 6^2 - 2*5*6*\cos(x)\\\\100 = 25 + 36 - 60*\cos(x)\\\\100 = 61 - 60*\cos(x)\\\\100 - 61 = - 60*\cos(x)\\\\39 = - 60*\cos(x)\\\\\cos(x) = \frac{39}{-60}\\\\\cos(x) = -0.65\\\\x = \arccos(-0.65)\\\\x \approx 130.5416\\\\x \approx 130.5\\\\$