The common multiple for 1/2 1/4 1/6 1/3 and 1/5 would be 60: 
2 x 30 = 60
3 x 20 = 60 
4 x 15 = 60
5 x 12 = 60 
6 x 10 = 60 
        
             
        
        
        
Answer:
n= 4f/5+90
Step-by-step explanation:
f=  5(n−90)
/4 (simplify)
f * 4=5(n−90)  (multiply 4 on both sides)
4f=5(n−90)  (regroup)
4f/5
 =n−90 (divide 5 on both sides)
4f/5
 +90=n  (add 90 to both sides)
  
 
        
             
        
        
        
Answer:
Right angles = 90 if more its not a right angle
Step-by-step explanation:
 
        
             
        
        
        
Answer:
c.
Step-by-step explanation:
Move the constant to the right side and the sign
0.5x=26-6
Calculate
0.5x=26-6=20 >>> 0.5x=20
divide both sides of by the equation 0.5
0.5x=20 >>> x=40