47. Gateway Arch The Gateway Arch in St. Louis is 630 ft high and has a 630-ft base. Its shape can be modeled by the parabola Find the average height of the arch above the ground. -300 630 ft -200 -100 y 600+ 500+ 400+ 300+ 200- 100+ 0 y = 630 y = 630 (1-(315)²) 630 ft 100 (¹-(315)²). 200 300

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