I NEED TO PASS THIS COURSE

Which of the following expressions is a polynomial?

z2-1+z

z-2-1

5/y

7z-3+2

45% of the trees in a park are apple trees. there are 27 apple trees in the park. how many trees are in the park in all?

Michael is training for a marathon. in his first week he plans to run 8miles. what path should he take

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?