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KIM [24]
3 years ago
11

Can it figure how to do this cosine out

Mathematics
1 answer:
Gnesinka [82]3 years ago
3 0

Answer:

  BC= 14.6

Step-by-step explanation:

The law of cosines tells you ...

  BC² = AB² +AC² -2·AB·AC·cos(A)

  BC² = 9² +12² -2·9·12·cos(87°) ≈ 213.695

  BC ≈√213.695 ≈ 14.6

The length of BC is about 14.6 units.

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12. Find the value of x.<br> HELP PLS HELP
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Answer:

x = 16

Step-by-step explanation:

 SR = ST ⇒ Two sides are equal. So, ΔSRT is an isosceles triangle.

The angles opposite to equal sides are equal.

  ⇒  ∠STR  = ∠R

       ∠STR = 4x - 28

Linear pair: If a ray stands on a line, then the adjacent angles are supplementary and they are called linear pair

∠STR + ∠STU = 180°    {linear pair}

4x - 28 + 9x = 180

4x + 9x - 28  = 180      {Combine like terms}

       13x- 28 = 180

Add 28 to both the sides

          13x    = 180 + 28

           13x  = 208

Divide both sides by 13

              x = 208/13

  \sf \boxed{x = 16}

8 0
2 years ago
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A square has vertices (a,0) , (0,a) , and (a, 2a) find the fourth vertex
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the fourth vertex would be the reverse of the third one.

The fourth vertex would be (2a, a)

3 0
3 years ago
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Between what two consecutive integers does √35 lie?
SSSSS [86.1K]

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3 years ago
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The weight of 1000 identical samples of a substance is 10 pounds. What is the weight of 10 samples?
Delvig [45]
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The bar graph in the following graphic represents fictional net exports in billions of dollars for five countries. Net exports a
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Answer:

$80 billion

Step-by-step explanation:

From the graph, we have the following:

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Germany = 40

Spain = 30

Required

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The difference is calculated as thus:

Difference = Denmark - United\ States

This gives:

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Difference = 80

<em>Hence, the difference is $80 billion</em>

8 0
3 years ago
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