Answer:
8 × 10¹³
Step-by-step explanation:
=> 
=> 
<u><em>When bases are same, powers are to be added.</em></u>
=> 8 × 10 ⁶⁺⁷
=> 8 × 10¹³
9 and 39/100 or 9 and 390/1000
Answer:
4 hours = 14400 seconds.
Step-by-step explanation:
i) In 1 hour there are 60 minutes
ii) in 1 minute there are 60 seconds
iii) therefore 1 hour = 60 minutes
= 60
60 seconds
= 3600 seconds
iv) therefore to convert 4 hours to seconds we have to multiply the number of hours by 3600 seconds
therefore 4 hours = 4
3600 seconds = 14400 seconds.