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3 years ago

Help me please as soon as possible

Mathematics

2 answers:

Stella [2.4K]3 years ago

6 0

90+31= 121
3x-1+121=120
3x+120=180
-120
3x=60
Divide by 3 on both sides
X=20

Nookie1986 [14]3 years ago

4 0

X=15

90+31+3x-1=180
121+3x-1=180
120+3x=180
3x=60
X=15

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3 years ago

X + (-4) = -2 What does X repesents??? Please help

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Answer:

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Step-by-step explanation:

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sladkih [1.3K]

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S₁₄ = C₀₁ + C₀₄ - C₁₄ = 20 + 10 - 20 = 10

S₁₅ = C₀₁ + C₀₅ - C₁₅ = 20 + 30 - 15 = 35

S₂₃ = C₀₂ + C₀₃ - C₂₃ = 75 + 33 - 18 = 90

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3 years ago