Miley Cyrus

standard form and chemistry questions?? help please!!!?

Give all the answers to the following questions in standard form and in the original units please:

10. A voltmeter is altered so that its settings are always 2*10^4 times too low. It gave a reading of 3*10^6 µA in an experiment. What should the reading have been?
11. A biomedical scientsist prepares a petri dish with agar and inoculates it with campylobacter. The scientist was expecting a colony of 6.9*10^5 bacteria. When analysed, the sample was found to contain the original number of bacterial colonies divided by 2*10^-6 bacteria. How many bacterial colonies had grown? was this more or less than expected?

also could some one please tell me what 6 399 969 000 = in standard form.
thankyou for all the help and please include working ouy. i appreciate it