Question 68240
To find the log of a number to any base, we can use a conversion formula as shown here:
log b A=log a/log b
Using this formula,log 2 1000 
-----------------------
log(base2)1000= [log 1000]/[log2]
=3/0.3010299957...
=9.96578425...
--------
Cheers,
Stan H.