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.
 
        
             
        
        
        
        
Answer:
7
Step-by-step explanation:
-8 is a negative number for example if you have -8 and you wanna get it to 0 you add 8 you don't have to do that with 7 it's a "positive" number
 
        
                    
             
        
        
        
<h2>
Answer:</h2>
C = 2πr
r = C/2π ...(1)
A = πr²
A = π(C/2π)² = πC²/4π²
A = C²/4π.
<u>Correct choice</u> - [A] A = C²/4π.
 
        
        
        
Answer:
The number of trees at the begging of the 4-year period was 2560.
Step-by-step explanation:
Let’s say that x is number of trees at the begging of the first year, we know that for four years the number of trees were incised by 1/4 of the number of trees of the preceding year, so at the end of the first year the number of trees was , and for the next three years we have that
, and for the next three years we have that
                              Start                                           End
Second year      --------------
 --------------   
Third year     -------------
-------------
Fourth year   --------------
--------------
So  the formula to calculate the number of trees in the fourth year  is  
 we know that all of the trees thrived and there were 6250 at the end of 4 year period, then
 we know that all of the trees thrived and there were 6250 at the end of 4 year period, then  
 ⇒
⇒
Therefore the number of trees at the begging of the 4-year period was 2560.