a number increased by 16 is the same as 3 times the numbera number increased by 16 is the same as 3 times the number

Y=4x^2+x-1 solve using quadratic formula

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Astuntman jumping off a 20-m-high building is modeled by the equation h=20-5t^2, where t is the same in seconds. a high-speed camera is ready to film him between 15m and 10m above the ground. for which interval of time should the camera film him?