1 centimeter = 10 milimeters.
Therefore, 8.5 centimeters squared = 85 millimeters squared.
        
             
        
        
        
we know that
Perimeter of a triangle is equal to
P=a+b+c
where
a,b and c are the length sides of the triangle
<u>Find the perimeter of the triangles</u>
<u>Triangle N 1</u>
P=(x-2)+(x)+(3x+1)-------> P=5x-1
<u>Triangle N 2</u>
P=(2x-5)+(x+4)+(6x-7)------> P=9x-8
equate the perimeters
5x-1=9x-8--------> 9x-5x=-1+8-------> 4x=7
x=7/4------> x=1.75
therefore
the answer is
x=1.75
 
        
             
        
        
        
The first term, a, is 2.  The common ratio, r, is 4.  Thus,
a_(n+1) = 2(4)^(n).
Check:  What's the first term?  Let n=1.  Then we get 2(4)^1, or 8.  Is that correct?  No.
Try this instead:
a_(n) = a_0*4^(n-1).  Is this correct?    Seeking the first term (n=1), does this formula produce 2?      2*4^0 = 2*1 = 2.  YES.
The desired explicit formula is   a_(n) = a_0*4^(n-1), where n begins at 1.