Answer:
He needs 8.75 ft² polka dot paper to cover the board.
Step-by-step explanation:
How much polka dot paper she need to cover the board is the area of the board . The is a rectangle with length 3.5 ft long and width of 2.5 ft wide .
The area of the board(rectangle) = length × width
Area = LW
where
L= 3.5 ft
W = 2.5 ft
Area = 3.5 × 2.5
Area = 8.75 ft²
He needs 8.75 ft² polka dot paper to cover the board.
 
        
             
        
        
        
The relationship between 2/3 of 3/4 and 3/4 of 2/3 is that the product will equal the same because in multiplication, it doesn't matter what order you put the numbers in because it will equal the same product.
        
             
        
        
        
So : 

?
First, you want to bring everything together on the top of the fraction. 
12=24/2 so you can have 

Add like terms -- 12 +24 = 36       

Now we are at 

 Which is the lowest possible simplified version while remaining at exact value. 
Feel free to check my math! I kinda did this off the top of my head. 
 
        
        
        
C, not sure but C. It makes sense to me & I got it right when I did it
 
        
                    
             
        
        
        
Answer:
94 cm
Step-by-step explanation:
Set up and solve an equation of ratios:
wingspan         length
60 meters        70.5 m
----------------- = ----------------
80 cm                   x
Cross multiplying:
(60 m)x = (70.5 m)(80 cm)
Solve for x by dividing both sides of this equation by 60 m:
x = (70.5 m)(80 cm) / (60 m) = 94 cm
The length of the model should be 94 cm.