here: :)
I did the work, and basically i solved for the area of the faces and then multiplied that by two to get the total surface area of the faces. Then I added in the areas of the sides connecting the two faces:
just as a referral: the formulas to find the faces are as follows:
rectangle: length times width
circle: pi x r^2
trapezoid: h(base1 + base2)
and triangle: (b x h)/2
The square of a binomial is written like

In your case, you have
, which implies 
So, we want to write

But our left hand side is

If we add 26 to both sides, we have

Answer:
The frequency is 3 more than expected.
3.6m − 2.7 = −1.8m
Subtract 3.6m from both sides:
-2.7 = -5.4m
Divide both sides by -5.4:
m = -2.7 / -5.4
m = 0.5