Question

a machine is a device that can make work easier.
there are 6 simple machines:
a lever is a bar that pivots around a fulcrum (the pivot point).
an inclined plane is a flat surface that slopes.
a wheel and axle is a wheel attached to a smaller axle. these two parts rotate together to create a simple machine.
a wedge is two inclined planes back to back.
a pulley is a grooved wheel with a cable wrapped around it.
a screw is an inclined plane wrapped around a post.
a compound machine is a device made up of two or more simple machines.
what is a compound machine?
a ramp made of one inclined plane
a device made of a wheel and axle
a device made up of two or more simple machines

Explanation:

A compound machine is defined as a device made up of two or more simple machines. The first option (a ramp made of one inclined plane) is a simple machine. The second option (a device made of a wheel and axle) is also a simple machine. The third option aligns with the definition of a compound machine.

Answer:

A device made up of two or more simple machines