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balandron [24]
3 years ago
5

For positive acute angles A and B, it is known that cos A = 4/5 and tan B =5/12 Find the value of cos(A + B) in simplest form.

Mathematics
1 answer:
lys-0071 [83]3 years ago
5 0

Answer:

33/16

Step-by-step explanation:

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Answer:

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Anarel [89]

9514 1404 393

Answer:

  1. 48°
  2. 60°
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Step-by-step explanation:

The sum of ratio units is 4+5+6 = 15, so each unit stands for 180°/15 = 12°. Multiplying the ratio units by 12° gives the angle values:

  4×12° : 5×12° : 6×12° = 48° : 60° : 72°

Angles 1 to 3 are 48°, 60°, 72°, respectively.

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3 years ago
Help find x. I believe it’s 13
aksik [14]

Answer:

m∠RST = 155°

m∠RSU = 102°

Step-by-step explanation:

m∠RST  = m∠RSU + m∠UST

12x - 1    = 9x - 15 + 53

12x - 9x = 1- 15 + 53

      3x   = 39

        x   = 39/3

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m∠RSU = (9x -15)° = (9 * 13 - 15)° = ( 117 - 15)° = 102°

4 0
3 years ago
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