Which table represents a non-proportional situation?

x f(x)
–1 –3
0 0
1 3
4 12

x f(x)
–2 2
0 4
2 6
3 7

x f(x)
–1 –3
0 0
1 3
2 6

x f(x)
–1 2
0 0
1 –2
2 –4

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?