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Jet001 [13]
3 years ago
15

14+13y=20y-21 work for answer?

Mathematics
2 answers:
andre [41]3 years ago
8 0

Answer:

Y= 5

Step-by-step explanation:

14+13Y=20Y-21

    -13y  -13y

14=7y-21

+21      +21

35/7=7y/7

y=5

 

nordsb [41]3 years ago
8 0

Answer:

y = 5

Step-by-step explanation:

14 + 13y = 20y - 21

take 13y from both sides

14 = 7y - 21

add 21 to both sides

35 = 7y

divide both sides by 7

y = 5

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If tan0=-3/4 and 0 is in quadrant IV, cos20= (33/25, -17/25, 32/25, 7/25, 24/25?) and tan20= (24/7, -24/7, 7/25, -7/25, 13/7, -1
Oksana_A [137]

Answer:

  • cos(2θ) = 7/25
  • tan(2θ) = -24/7

Step-by-step explanation:

Sometimes, it is easiest to let a calculator do the work. (See below)

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The magnitude of the tangent is less than 1, so the reference angle will be less than 45°. Then double the angle will be less than 90°, so will remain in the 4th quadrant, where the cosine is positive and the tangent is negative.

You can also use the identities ...

  cos(2θ) = (1 -tan(θ)²)/(1 +tan(θ)²)

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  cos(2θ) = 7/25

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  tan(2θ) = 2tan(θ)/(1 -tan(θ)²) = 2(-3/4)/((16-9/16) = (-6/4)(16/7)

  tan(2θ) = -24/7

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3 years ago
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Step-by-step explanation:

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2 years ago
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