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Lana71 [14]
2 years ago
10

18. What is the value of j in the equation √ j + √ j + 14 = 3√ j + 10? A. 16 B. √ 2 C. 4 D. 2

Mathematics
1 answer:
Rudik [331]2 years ago
4 0

Answer:

  A. 16

Step-by-step explanation:

The equation can be simplified to ...

  2√j +14 = 3√j +10

  4 = √j . . . . . add -2√j -10

  16 = j . . . . . . square both sides

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lets multiply the first equation by -10 and then add it to the second equation:
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</span>-----------------------
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x = 20/4
x = 5
then substitute in the original equation:
x + y = <span>12
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</span>y = 12 - 5
y = 7
therefore there were 5 adults and 7 children
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