Twenty students hold a chess tournament in which each of the students will play every other student in the group once. How many individual contest will be held?

At a fixed temperature the resistance (R) of a wire varies directly as the length (l) and inversely as the square of its diameter (d). If the resistance is 0/1 ohm when the diameter is 1mm and the...

The volume (V) of wood in a tree varies jointly as the height (h) of the tree and the square of the girth (g). If the volume of a redwood tree is 216m^3 when the height is 30m and the girth is 1.5m...

How do I solve this problem I just need to know how to set up so I can learn how to solve it myself I am kind of stuck and I just need help on how to solve it.

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I am struggling with this question,
a salt bridge in a battery
a. causes positive charges to build up where oxidate takes place
b. causes negative charges...