I do not understand why there are two decimal places.
But either ways if you are asking for :
0.0000489 then it is 4.89*10⁻⁵
0.489 then it is 4.89*10⁻¹
The trick is to count the zeroes to the first actual significant number you see and then write the number you counted with a negative sign for your power. 
I hope this helps!
        
             
        
        
        
Answer:
1/25 of a mile per minute, I think
Step-by-step explanation:
 
        
                    
             
        
        
        
Answer:
1
Step-by-step explanation:
Since they are not parallel nor the same line, they have 1 intersecting point, which is the solution.
If they were parallel, they would have no solution.
If they were the same line, they would have infinite solutions.
 
        
             
        
        
        
Answer:
90
Step-by-step explanation:
 
        
                    
             
        
        
        
Find the volumes of each separate rectangular prism, (top) 9 x 4 x 12 = 432 cubic meters, (bottom) 10x2x2 = 40 cubic meters, and then add them together to get the overall volume, 40+432 = 472 cubic meters. the strategy is using length times width times height, LxWxH.