Match the following:Part A1. the reaction of a substance with oxygen, releasing heat energy and/or light 2. a process during which waste gases are expelled from an engine cylinder 3. the combustion process as it occurs outside the engine 4. a process that draws fuel mixture into an engine cylinder 5. an engine process during which fuel ignites and product gases push against the piston 6. a process that pressurizes the fuel mixture in an enginePart Ba. combustion b. compression stroke c. exhaust stroke d. external combustione. intake strokef. power stroke

what is the actual question though?

electromagnetic shielding is the practice of reducing the electromagnetic field in a space by blocking the field with barriers made of conductive or magnetic materials. shielding is typically applied to enclosures to isolate electrical devices from their surroundings, and to cables to isolate wires from the environment through which the cable runs. electromagnetic shielding that blocks radio frequency electromagnetic radiation is also known as rf shielding.

the shielding can reduce the coupling of radio waves, electromagnetic fields and electrostatic fields. a conductive enclosure used to block electrostatic fields is also known as a faraday cage. the amount of reduction depends very much upon the material used, its thickness, the size of the shielded volume and the frequency of the fields of interest and the size, shape and orientation of apertures in a shield to an incident electromagnetic

from wikipedia

the old price per ounce is c/4.

the new price per ounce is c/3.6.

the ratio of the old price to the new one is

(c/4)/(c/3.6) = (c/c)×(3.6/4) = 0.9 . . = 9/10 . . "nine tenths" in either form