Which expressions are polynomials? Select each correct answer. A. 7y2+9x4

B. y2+3x134

C. 6y2+5x

D. 7x2+84x

4. if you were an astronaut on the moon, what would you experience? what would you see from your perspective?

Which of the following is the main energy source for the sun? a. fission of hydrogen b. fusion of hydrogen c. fusion of helium d. fission of iron

Alarge cruise ship of mass 7.00 ✕ 107 kg has a speed of 11.6 m/s at some instant. (a) what is the ship's kinetic energy at this time? (b) how much work is required to stop it? (give the work done on the ship. include the sign of the value in your answer.) (c) what is the magnitude of the constant force required to stop it as it undergoes a displacement of 3.00 km?