C. 30°,60°,90° due to the fact that it's a right triangle
 
        
                    
             
        
        
        
Answer:
The third one
Step-by-step explanation:
y=>x+1
y=<x-1
removing y 
x-1 => x+1
removing x 
we have no solution 
 
        
                    
             
        
        
        
Given, the ratio of blocks A, B, C,D are in the ratio 4:7:3:1
Let us consider the common ratio to be ‘x’.
So, toy blocks with alphabet A is 4x and
toy blocks with alphabet B is 7x and 
toy blocks with alphabet C is 3x and
toy blocks with alphabet D is x
Again, the number of ‘A’ blocks is 50 more than the number of ‘C’ blocks.
As no. of ‘A’ and ‘C’ blocks are 4x and 3x respectively.
So,
4x=50 + 3x 
x=50
Thus, the number of ‘B’ blocks is 7x = 7(50) = 350
350 is the required number.
        
                    
             
        
        
        
Answer:
The sum of the roots is 0.5
Step-by-step explanation:
<u><em>The correct question is</em></u>
What is the sum of the roots of 20x^2-10x-30
we know that
In a quadratic equation of the form 
 
 
The sum of the roots is equal to
 
in this problem we have
 
  
so

substitute
 
<u><em>Verify</em></u>
Find the roots of the quadratic equation
The formula to solve a quadratic equation is equal to


substitute





The roots are x=-1 and x=1.5
The sum of the roots are
 ----> is ok
 ----> is ok
 
        
             
        
        
        
Answer:
Listeriosis is an infection caused by the bacteria Listeria monocytogenes. People become infected by eating foods contaminated with the bacteria. Listeria may infect many different sites in the body, such as the brain, spinal cord membranes, or the bloodstream
Step-by-step explanation:
People with invasive listeriosis usually report symptoms starting 1 to 4 weeks after eating food contaminated with Listeria