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kirza4 [7]
3 years ago
5

What is (5-4b) (3-8b)

Mathematics
2 answers:
nadezda [96]3 years ago
6 0
(5 - 4b)(3 - 8b)
15 - 40b - 12b + 32b²
15 - 52b + 32b²
tester [92]3 years ago
5 0
15-40b-12b+32b^2 so your final answer in standard form would be 32b^2-52b+15
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Crazy boy [7]

Answer:

  n = 245/36

Step-by-step explanation:

Usually, these are solved in 2 steps:

  1. eliminate fractions by multiplying by the LCM of the denominators
  2. divide by the coefficient of the variable.

Doing that, we have ...

  (49n)(36/49) = (49n)(5/n)

  36n = 49·5 = 245 . . . . . simplify

  n = 245/36 . . . . . divide by the coefficient of n

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Another way to do these is to rewrite the proportion with both sides inverted:

  49/36 = n/5

Now, all you need to do is multiply by 5.

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Or, you can do both of the original steps at the same time:

  (49n/36)(36/49) = (49n/36)(5/n)

  n = (49·5)/36 = 245/36

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So cos40° must equal cos(-45°) which is 0.707.

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