Which statement is true about the composite solid?

The solid has a total of 9 faces.

There are the same number of triangular faces as there are rectangular faces.

The solid is formed by joining a rectangular pyramid and a triangular prism at a common face.

If all of the triangular faces are congruent, then all of the rectangular faces must be congruent as well.

C

Step-by-step explanation:

The solid is formed by joining a rectangular pyramid and a triangular prism at a common face.

See evidence at attached picture

reduce the friction between its moving parts

step-by-step explanation:

in fact, by reducing the friction between the moving parts of the machine, it is possible to reduce the energy wasted due to this friction; therefore, more input energy is converted into useful work, and this will improve the efficiency of the machine.

answer: x=3 and y=4

step-by-step explanation: