Answer:

Step-by-step explanation:


 
        
             
        
        
        
Answer:
13 
Step-by-step explanation:
5 has been added by the 21 to make 27 to leave with adding 5 to old y and leaving the new variable y 13
 
        
             
        
        
        
Theorem: pythagorean 
Equation: 5^2 + h^2 = 8^2 
Solving: 
25 + h^2 = 64 
h^2 = 39 
h = 

Hope this helps!! :)
 
        
        
        
Part A: the radicand is the same as the discriminant, therefore is b2 - 4ac
In 9x^2 - 16x + 60 = 0, a = 9, b = -16, c = 60
so b2 - 4ac =

Part B: Solve 4x^2 + 8x - 5 = 0
What would make 8? (5×2)-2 = 8, so:
(2x+5)(2x-1) = 0
2x+5 = 0
2x = -5
x = -5/2
2x-1 = 0
2x = 1
x = +1/2
So the solutions are: -5/2, +1/2
 
        
        
        
<span>There are 4 pair of numbers that add up to 16. So you would need to choose at least 5 numbers to ensure that you got at least one of those pairs.</span>