Take 5 × 3 to equal 15
add the 1 +4.5+2.9+1
to equal 12.4
2.6
We have the following:

solving for x

The solution of x is equal to 28, therefore 12 is not a solution of the equation
The answer is 45. there are 5 sides. each one is 9cm. 9*5= 45.
hope this helps.
I think the answer is going to be 3s