In 4 hours if you count the miles by the road linking the 2 buses. This is because 55 for one bus and 45 for the other bus added together equals 100 miles/hour. Therefore, 4 hours will be the time the 2 buses are 400 miles apart.
6. 37 x 10^4 in standard form would be 63,700.
Answer:

Step-by-step explanation:
For easy calculations let's use the supplementary angles:






Now lets calculate the magnitude of the vector C:

where:


Finally:
