First, put parenthesis around the first two numbers and the last two numbers. 
(20g³+24g²) (-15g-18)
Then, take out the greatest common factor of both parenthesis. 
4g²(5g+6)-3(5g+6)
You then separate the numbers outside the parenthesis and the numbers in the parenthesis. 
(5g+6) (4g²-3) 
Then you simplify the second set of numbers. Since the set of numbers can't be simplified, you would leave this problem as it is. I hope this makes sense.
        
             
        
        
        
Answer:
one
Step-by-step explanation:
they meet at only one point, thus their system of equations has as solution only those coordinates.
 
        
             
        
        
        
Answer:
well the answer is 0.185
Step-by-step explanation:
 
        
             
        
        
        
Answer: 225 students would have at least one sibling. 
 
Step-by-step explanation:
Three out of four is the same as  3/4 meaning that if there are 300 students in your school then 3/4 times 300 will give the number of students with at least one sibling.  
3/4 * 300 = 225  
This means 225 students would have at least one sibling.