Question: 1. Write an expression that represents the arc length of the concave-down portion of the graph of f(x) = x4 -8x3 + 18x2 + 3x + 7. Do not simplify or evaluate the answer.
2. With x and b in meters, a chain hangs in the shape of the catenary cosh
x = (1/2)(ex + e-x) for -b ≤ x ≤ b
If the chain is 10 meters long, how far apart are its ends?