Answer:
An artist use 51.9 feet of string for constructing a piece of art in the shape of rectangle
Step-by-step explanation:
Here an artist is constructing a piece of art in the shape of rectangle having length 12 feet & width of 7 feet 
Since the artist wants to use string to tightly tie each vertex of rectangle to the other three vertices. Hence one string will tie in a diagonal way 
Hence total length of string will be 
Total length = Perimeter of rectangle  +  length of diagonal 
Perimeter of rectangle  = 2( length + width ) = 2 ( 12 + 7 ) = 2 x 19 = 38 feet 
Length of diagonal given by Pythagoras theorem

Hence 
Total length = Perimeter of rectangle  + length of diagonal 
Total length = 38 feet + 13.89244 feet = 51.9 feet 
Hence an artist use 51.9 feet of string for constructing a piece of art in the shape of rectangle
 
        
             
        
        
        
Answer:
327.25
Step-by-step explanation:
550*0.7=385
385*0.85=327.25
!!! MUST REMEMBER!!!
dont add 30% and 15% together, 15% is another discount on the price that has been marked down.
 
        
             
        
        
        
There are three types of each note cards and three sizes of each type, the sizes dont matter. So you could say 3 times 3 equals 9.                                                                                                                                                                                                                                                          Answer: (you add 3, 3 times equals 9) or say (3 times three equals 9)
        
             
        
        
        
So you can know which pair to use in order to solve the problem.