Can someone help me figure out the ones I missed.

Solve each equation using the quadratic formula. find the exact solutions. 6n^2 + 4n - 11

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?

If a flying disk is 139 meters in the air and travels at an average of 13 m/s how long is it in the air