Kat is painting the edge of a triangular stage prop with reflective orange paint. The lengths of the edges of the triangle are (3x – 4) feet, (x2 – 1) feet, and (2x2 – 15) feet. What is the perimeter of the triangle if x = 4?

Substitute x = 4 into each edge length. The sides are 3(4) − 4 = 8 feet, 4² − 1 = 15 feet, and 2(4²) − 15 = 17 feet. Add them: 8 + 15 + 17 = 40 feet, so the perimeter is 40 feet, choice B.

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