Answer:
10.7cm
Step-by-step explanation:
x^2= 115
x = √115
x = 10.7
 
        
             
        
        
        
Answer:
RC = 40
Step-by-step explanation:
Note that the circumcentre is equally distant from the triangle's 3 vertices.
That is : PC = RC = QC
Equate any pair and solve for x
Using RC = PC, then
5x - 15 = 3x + 7 ( subtract 3x from both sides )
2x - 15 = 7 ( add 15 to both sides )
2x = 22 ( divide both sides by 2 )
x = 11
Hence
RC = (5 × 11) - 15 = 55 - 15 = 40 units
 
        
             
        
        
        
The simplest form for this fraction is (A)
You divide both the numerator and denominator by 9, you will get 3/5. 
so the answer is A.
        
             
        
        
        
7x-4=3x+ 8
-3x of both sides 4x-4=8
plus 4 to both sides 4x=12
12 divide by 4 = 3
hopeful that helps
        
                    
             
        
        
        
Step-by-step explanation:
its 60