Octavia are o suma de bani daca si ar cumpara 4 carti iar mai ramane 6 lei daca si ar cumpara 7 carti de acelasi fel ar mai avea nevoie de 18 lei cati lei are octavia

each side has a different length.  

step-by-step explanation:

1. 3. can also be expressed as (22/7)

2. -4.5

3. 3.6

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the answer is 21%.

take the logarithm of both sides (the base of the log doesn't matter):

apply the exponent property - this says that :

distribute the log terms on both sides:

group like terms together:

divide through both sides by the coefficient on :

you can do some additional rewriting here using the properties of the logarithm to simplify things if you like: