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in this lesson were going to focus on evaluating logs so what is log base 2 of 16 what is that equal to 2 raised to the what power is 16. how many twos do you have to multiply to get to 16 2 times 2 times 2 times 2 4 times 16 so therefore 2 to the fourth is 16. so log base 2 of 16 is equal to four so now that you know that what is log base 3 of 27 how many threes do you need to multiply to get to 27 you need to multiply 3 3 times it gets 27 3 times 3 times 3 is 27 so log base 3 of 27 is 3. now what about log base 5 of 25 how many fives do you have to multiply to get to 25 you need to multiply two fives five squared is 25. now what about log base four of one log of one is always equal to zero what about log base seven of seven to the first power is seven so if these numbers are the same they will cancel its simply one now what is log of a thousand what should you do if youre not given a base if there is no base its always assumed to be a ten so how many tens do you have to multiply