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Answer: x=4
Step-by-step explanation:
We have two right triangles and three different rectangles.
The formula of an area of a right triangle:

l₁, l₂ - legs
We have l₁ = 20cm and l₂ = 21cm. Substitute:

The formula of an area of a rectangle:

l - length
w - width
We have:
rectangle #1: l = 22cm, w = 29cm

rectangle #2: l = 22cm, w = 21cm

rectangle #3: l = 22cm, w = 20cm

The total Surface Area of the triangular prism:

Answer:
![\sqrt[4]{\frac{5}{7} }](https://tex.z-dn.net/?f=%5Csqrt%5B4%5D%7B%5Cfrac%7B5%7D%7B7%7D%20%7D)
Step-by-step explanation:
^4√5/^4√7
~Apply radical rules
^4√5/7
Best of Luck!