The formula s=16t^2 is used to approximate the distance s, in feet, that an object falls freely from rest in t seconds. the height of a building is 1221 feet . how long would it take for an object to fall from the top

Ascientist has 50 grams of a radioactive element. the amount of radioactive element remaining after t days can be determined using the equation (1) after two days the scientist receives a second shipment of 50 grams of the same element. the equation used to represent the amount of shipment 2 remaining after t days is 10) - 50 which of the following is an equivalent form of the expression for the amount remaining in shipment 2? what’s the answer?