7^2+5^2= 74 now you have to square root 74 which is 8.60233 or 8.6
        
             
        
        
        
Answer:
143cm
Step-by-step explanation:
Area=2(l+b)
Substitute the values for the variables.
66=2(l+22/5)
66=2xl+2x<u>22</u>
 5
66=2l+<u>44</u>
 5
Cross multiply
66x5=2l+44
330=2l+44
Collect like terms
-2l = 44-330
-2l = -286
<u>-2l </u>=<u> </u><u>-286</u>
-2 -2
l=143
The missing length is 143m.
 
        
             
        
        
        
The number is 1/6. 15 minus 3 = 12. 12 times 1/6 is 2