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NeX [460]
2 years ago
12

Two times the sum of a number and 8 is twenty. What is the number?

Mathematics
1 answer:
natka813 [3]2 years ago
3 0

Answer:

n=2

2(n+8)=20

2n+16=20

     -16  -16

2n=4

/2   /2

n= 2

Hope this helps :)

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F(3)= 5x^2 - 4x + 9<br> evaluate this quadratic function
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Answer:

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Step-by-step explanation:

Given the quadratic function

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f\left(x\right)=\:5x^2\:-\:4x\:+\:9

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f(3) = 38

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