Question

tiles: lever, inclined plane, wedge, screw, wheel and axle, pulley. pairs: has a spiral surface wrapped around a rod, has a sharp edge or point, has two cylinders of different sizes, has one slanting side, has a rigid bar and a fulcrum, has a rope and a wheel

Explanation:

Each description corresponds to a simple machine's defining feature: screw has a spiral surface, wedge has a sharp edge/point, wheel and axle has two different-sized cylinders, inclined plane has a slanting side, lever has a rigid bar and fulcrum, pulley has a rope and wheel.

Answer:

has a spiral surface wrapped around a rod → screw
has a sharp edge or point → wedge
has two cylinders of different sizes → wheel and axle
has one slanting side → inclined plane
has a rigid bar and a fulcrum → lever
has a rope and a wheel → pulley