3 years ago

3n+8=20 i need help i think it is algerbra

Mathematics

2 answers:

Minchanka [31]3 years ago

7 0

3n+8=20
8+3n=20
3n=20+-8
3n=12
n=4

tia_tia [17]3 years ago

4 0

turn the problem around

20-8=12

12/3=4

Your answer is 4.

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3 years ago

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Solve |2x - 5| = 4 someone help

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$\text{Solve the absolute value, remember, there are two answers/outcomes}\\\\\text{First outcome:}\\\\2x - 5 = 4\\\\\text{Solve:}\\\\2x - 5 = 4\\\\\text{Add 5 to both sides}\\\\2x=9\\\\\text{Divide by 2}\\\\\boxed{x=\frac{9}{2}}\\\\\text{Second outcome:}\\\\2x - 5 = -4\\\\\text{Add 5 to both sides}\\\\2x=1\\\\\text{Divide by 2}\\\\\boxed{x=\frac{1}{2}}$