<h2>
Weight of column is 555.83 N</h2>
Step-by-step explanation:
Size of column = 6 inch x 6 inch x 8 ft
Size of column = 0.5 ft x 0.5 ft x 8 ft
Volume of column = 0.5 x 0.5 x 8 = 2 ft³
Specific weight of concrete = 62.4 lb/ft³
Mass = Volume x Specific weight
Mass = 2 x 62.4
Mass = 124.8 lb = 124.8 x 0.454 = 56.66 kg
Weight = 56.66 x 9.81 = 555.83 N
Weight of column is 555.83 N
Only Adam's proof is correct.
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Answer: C(x) = 3x + 3
<u>Step-by-step explanation:</u>
C(x) = mx + b
Given: when x = 3 hours, C(x) = $21 total charge, b = $3 skate rental
21 = 3m + 3
18 = 3m
6 = m
Answer for any given x is: C(x) = 3x + 3