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ludmilkaskok [199]
3 years ago
10

How do I find the missing

Mathematics
1 answer:
Vsevolod [243]3 years ago
4 0

Answer:

x = 11.4783

Step-by-step explanation:

cos∅ = adjacent / hypotenuse

Since we are dealing with right triangles, we can use trig to help us solve missing values:

cos28° = x/13

13cos28° = x

x = 11.4783

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Let's simplify step-by-step.
8
x
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−
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−
(
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x
2
−
3
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Distribute the Negative Sign:
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+
−
1
(
10
x
−
5
x
2
−
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x
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)
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8
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3
+
−
x
+
−
1
(
10
x
)
+
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1
(
−
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x
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)
+
−
1
(
−
3
x
3
)
=
8
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3
+
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+
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10
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+
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2
+
3
x
3
Combine Like Terms:
=
8
x
3
+
−
x
+
−
10
x
+
5
x
2
+
3
x
3
=
(
8
x
3
+
3
x
3
)
+
(
5
x
2
)
+
(
−
x
+
−
10
x
)
=
11
x
3
+
5
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−
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Answer:
=
11
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