Beth walks 0.5 miles on each trip to the park. how far will beth walk if she makes 8 trips to the park?

Ihave trouble finding the nth term of a linear sequence

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?

Meee i honestly dont know what this question talking about