Thread: Logarithm Help

A, B, and D worked out, but when I try to do C I run into a problem.

I use the formula:
f(t)=90-15log(6+1)

For an answer I get:
90+log(1/474561509943)

Im pretty sure im doing something wrong because the other answers were more like 90 and 50

Originally Posted by whiteforlife

A, B, and D worked out, but when I try to do C I run into a problem.

I use the formula:
f(t)=90-15log(6+1)

For an answer I get:
90+log(1/474561509943)

Im pretty sure im doing something wrong because the other answers were more like 90 and 50

When I did 90-15log(7) I got an answer of 77.3 (3sf). Are you sure you put it in your calculator correctly?

Google's calculation

That was it. I did it in my calculator wrong 3 times. Thanks for catching my stupid mistake. Also for part E, would about 6 months be a correct answer or is it supposed to be exact?

Originally Posted by whiteforlife

That was it. I did it in my calculator wrong 3 times. Thanks for catching my stupid mistake. Also for part E, would about 6 months be a correct answer or is it supposed to be exact?

I got an answer of 9 (I assume t is in months)







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