To form a triangle the sum of the two shorter sides must be greater than the longest side.
5, 5, 3 forms a triangle (isosceles)
8, 8, 8 forms a triangle (equilateral)
5, 6, 10 forms a triangle (obtuse angled scalene)
7, 8, 15 technically forms a triangle with an area of zero units. The vertices would be co-linear.
This will often be ignored as it has little practical use.
Fun fact. If you break a stick into 3 random lengths there is only a 25% chance they will be able to form a triangle.
        
             
        
        
        
D
the answer is D. dilation cannot be used to prove this 
 
        
                    
             
        
        
        
40! / 30!  = 40*39*38*37*36*35*34*33*32*31
dividing this by 10!   10*9*8*7*6*5*4*3*2*1
 =    4*13*19*37*17*11*4*31
=      847,660,528
     
         
         
        
             
        
        
        
525 divided by 150 is 3.5
3.5= 3 hours and 30 mins
answer is b
        
             
        
        
        
You have to get from $30 to $21.75
21.75/30=0.725 x 100= 72.5% of the original price