Answer:
Step-by-step explanation:
 If the triangle is equilateral :
2x +y/2 =  5x/3+y + ½  = 2/3x +2y +5/2
so the perimeter is : P = 3(2x +y/2) or 3(5x/3+y + ½) or 3(2/3x +2y +5/2)
the simplest is :  P = 3(2x +y/2) 
                             P = 6x + (3y)/2 
 
        
             
        
        
        
Answer:
B)120º
Step-by-step explanation:
70+50=x
120=x
 
        
             
        
        
        
Answer:
B, irrational
Step-by-step explanation:
We know that π is irrational, since it can not be written as a division between  natural numbers (a sub class of Real numbers called N), it's value is 3,1415(a whole bunch of decimals after this)
If you remove the decimal part of π by subtracting the integer part of it, that is the number 3. the result will still being and irrational number
Since π= 3(the rational part) +0,1415... (the irrational part) 
The resut of π-=3= 0,1415...