Answer:
60
Step-by-step explanation:
sqrt(60×3×2×2×5)
sqrt(180×2×2×5)
sqrt(360×2×5)
sqrt(720×5)
sqrt(3600)
60
X+12=20 is 8.
x-9=17 and 2x=16 both have the same solution.
The answer should be X+12=20.
Answer:
The answer to your question is x = 12
Step-by-step explanation:
Data
BC = 7
DE = x
AB = 7
BD = 5
Process
To solve this problem use proportions and cross multiplication. Compare the ΔADE and ΔABC.
DE / (AB + BD) = BC / AB
-Solve for DE
DE = BC (AB + BD) / AB
-Substitution
DE = 7(7 + 5) / 7
-Simplification
DE = 7(12) / 7
DE = 84/7
-Result
DE = 12
The lame answer is that you put it into a calcuator and see.
The more formal way you know is if, when the fraction is reduced, the denominator's only prime factors are 2s or 5s. If that's the case, the fraction will terminate. If you have any prime factor other than 2 or 5, it will repeat.
But knowing that "2 or 5 prime factor" idea would have to be something specifically taught in your class (or a prerequisite class).
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