Which polynomials are in standard form?

choose all answers that apply:

(choice a)

3z−1

(choice b)

2+4x−5x^2

(choice c)

−5p^5+2p^2−3p+1

(choice d)

none of the above

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?