A machine has a mechanical advantage of 5. what force should be applied to the machine to make it apply 30000

Will you chech and finish these for me, because i am stumped with them.

We put a force of 50n on an object and the acceleration is 100 m/s². what is the mass of the object?

Choose all the answers that apply. our solar system: is in a spiral galaxy no longer includes pluto is made mostly of empty space is in the andromeda galaxy is the only known system that supports life