It depends on what is being calculated? Basically, a collection of something is counted as 1, 2, 3, and so on, to give a total. A simple instance is in counting loose two pence (UK) coins: piles of two pence coins are stacked in tens, then the piles are counted as 10, 20, 30, and so on. Or if there are 34 piles of 10 coins, then 34 x 10 = 340 pence (£3.40).
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The student is calculating the average or mean speed of the ball.
It is calibrating.
Quantity x+4 times quantity x+1.
Unknonwn quantity is any variable a,b,c or x,y
A constant that does not change!