I don't think you can as long as your not plus. 
 
        
                    
             
        
        
        
Answer:  
Step-by-step explanation:
Here, According to the question,  The population of the world is 4 billion (approx).
Again According to the question, The world's population has grown at an average rate of 1.9 percent per year since 1945. 
Therefore, after 1975 the growth rate will remains same.
Thus, the population of the world after t years,
 (By the formula
   (By the formula  )
 )
⇒
Where 1.019 is the growth rate and 4 billion is the initial population.
 
        
             
        
        
        
Answer:
3/12 = 1/4
Step-by-step explanation:
There are 12 marbles in the bag.  If the marble drawn at random is red, it is one of the 3 red marbles.
The probability is "3 out of 12" = 3/12 which simplifies to 1/4.
 
        
                    
             
        
        
        
Answer:
1) 250 meters= 0.25 km 
2) 12 meters=  0.012km
3) 1 meter= 0.001 km
The constant of proportionality is 1000 meters in 1km (1000 meters)
I think there’s a mistake on the second part because 1 meter does not equal to 1000km. but I did part 1 for you!
 
        
             
        
        
        
40%
The probability of her getting a red marble is the number of red marbles divided by the number of total marbles. Since she picked a green marble first, we must subtract one marble from the total number of marbles, so that the total # of marbles is 6 + 6 + 4 = 16 - 1 (green marble) = 15. Since there are 6 red marbles, our probability is 6/15 or 2/5. Converted to percentage form, this is 0.4 —> 40%