I need assistance with figuring out how to work out these problems:

1. Suppose a galaxy is moving away from the Earth at a speed 0.95c. It emits radio waves with a wavelength of 0.550 m. What wavelength would we detect on the Earth? Show your work.

2. Suppose a spaceship is approaching the Earth at 0.6c and shoots a canister at a speed of 0.550c. At what velocity will an Earth-bound observer see the canister if it is shot directly towards the Earth?