HELP PLEASE TIMED ASSIGNMENT GOING TO BE GIVING ALL MY POINTS IF THEY ARE CORRECT!

Which is f(5) for the function –2x2 + 2x - 3?

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?

10x − 5y + 14 = 0 whats the answer pls