Answer:
No, the given sequence is not arithmetic.
Step-by-step explanation:
The given sequence is

The first term is 5.
A sequence is an arithmetic, if the difference between any two consecutive terms are same.
The difference between terms are



Since the difference between consecutive terms are not same, therefore given sequence is not arithmetic.
-2x - 8 = -2x - 8 - 6
-2x - 8 = -2x - 14
-8 = -14, false
Solution: no solution
When trying to round off the answer.
168 cm²
The surface area is the combined area of all the sides of a figure.
Four sides have an area of 36 cm², so 144 cm²
Two sides have an area of 12 cm², so 24 cm²
144+24 = 168 cm²
Hope this helps, and please consider marking branliest.