What is an appropriate hypothesis for this experiment? A. If there are plants that get different amounts of soil then the plant that gets more soil will grow taller because the nutrient in the soil is needed for plant growth.
B. If there are two plants one that is given water every day and one that is given water every other day then, the plant that gets water every day will grow taller because water is needed for plant growth.
C. If there are plants that get different amounts of sunlight then the plant that gets more sunlight will grow taller because sunlight is needed for plant growth.

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