Answer:
45.05
Step-by-step explanation:
 The answer is 45.05 because I multiplied ( b and a) 8.5x5.3 and then I got 45.05.
 
        
             
        
        
        
Answer:
Step-by-step explanation:
let the consecutive even numbers be  2n-2,2n,2n+2,2n+4 where n>0 and n is an integer.
2n(2n+2)-(2n-2)(2n+4)
=4n²+4n-(4n²+8n-4n-8)
=4n²+4n-4n²-8n+4n+8
=8
 
        
             
        
        
        
Answer:
20300m^2
Step-by-step explanation:
first try to imagine the shape bisected into a rectangle and a triangle
to find the missing part of the triangle or the bottom side you need to subtract 70m from 140 m
140m-70m=70m this will be the base of your triangle 
now you need the side 
230m-60m=170
triangle formula base x height/ 2
70m x 170m=a
11900m=a
now the rectangle
base x height=a 
60m x140m=a
8400m=a
finally add the two quantities together
8400m+11900m=a 
20300m^2=a