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Mathematics 18 Online
zarkam21:

Help

zarkam21:

1 attachment
Vocaloid:

part I) is just replacing "R" with the given value 7.5 so 7 = 0.65log(0.39E) + 1.45 for part II) subtract 1.45 from each side, then divide both sides by 0.65 to isolate the log

Vocaloid:

*** so 7.5 = 0.65log(0.39E) + 1.45

zarkam21:

7 = 0.65log(0.39E) + 1.45 -1.45 -1.45 5.55=0.65log(0.39E)

Vocaloid:

value needs to be 7.5 not 7, I made a typo

zarkam21:

7.5 = 0.65log(0.39E) + 1.45 -1.45 -1.45 6.05=0.65log(0.39E) /0.65 /0.65 9.31=1log(0.39E)

Vocaloid:

good, then for part III) just solve that for E

zarkam21:

5235

Vocaloid:

check your calculations again raising both sides to base 10 gives us 10^(9.31) = 0.39E solve for E

zarkam21:

5.23523×10^9

Vocaloid:

good, then it's 5.23523×10^9 kWh = your ans

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