The system of equations:2 y = - x - 12 y = x + 5---------------------- x - 1 = x + 5- 2 x = 5 + 1- 2 x = 6x = - 6 : 2x = - 32 y = - 3 + 52 y = 2y = 1The solution is ( - 3 , 1 ).Answer: The x-coordinate of the solution to the system is:  x = - 3.
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That would simplify to 32x^5+400x^4+200x^3+5000x^2+6250x+3125
You would do that because you have to write it repeatedly as (2x+5)(2x+5) and so on.
        
             
        
        
        
Answer:
To find out the number coming from each school, you need to use the proportion of the school's population out of the population of all three. 
Total population = 618 + 378 + 204
= 1,200 students 
North Middle school:
= 618/1,200 * 20
= 10 students 
Central Middle School:
= 378 / 1,200 * 20
= 6 students 
South Middle School:
= 204/1,200 * 20
= 4 students 
 
        
             
        
        
        
<span>In mathematics, a multiplicative inverse or reciprocal for a number x, denoted by 1/ x or x −1, is a number which when multiplied by x yields the multiplicative identity, 1. The multiplicative inverse of a fraction a / b is b / a. For the multiplicative inverse of a real number, divide 1 by the number.</span>