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Gala2k [10]
3 years ago
9

How many solutions does the equation have?

Mathematics
2 answers:
nikklg [1K]3 years ago
6 0
B which equals -55 I think this is right
irina1246 [14]3 years ago
3 0
Since the coefficients of d are not equal, then there can only be one solution
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Write expression as a sine or cosine of an angle.<br>cos 94° cos 18° + sin 94° sin 18° ​
MArishka [77]
<h3>Answer:  cos(76)</h3>

=========================================================

Explanation:

The original expression is of the pattern cos cos + sin sin. This pattern matches the second identity in the hint. Specifically, we'll say the following:

cos(A - B) = cos(A)cos(B) + sin(A)sin(B)

cos(A)cos(B) + sin(A)sin(B) = cos(A - B)

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----------

We can verify this by use of a calculator. Make sure your calculator is in degree mode.

  • cos(94)cos(18) + sin(94)sin(18) = 0.24192
  • cos(76) = 0.24192

Both expressions give the same decimal approximation, so this helps confirm the two expressions are equal. You could also use the idea that if x = y, then x-y = 0. Through this method, you'll subtract the left and right hand sides and you should get (very close to) zero.

6 0
2 years ago
Eric spent $21.85, including sales tax, on 2 jerseys and 3 pairs of socks. The jerseys cost $6.75 each and the total sales tax w
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Answer

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Step-by-step explanation:

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Solve the equation. Use a calculator. c3 = 4 (Round to the nearest tenth as needed.)​
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3 years ago
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