VARIABLE & CONSTANT:
Variable :— A Quantity that can be change, The Quantity may increases or decreases . It may be independent or dependent. ex: x, y, z, p, q, r, s ,t ,d ,…..
Constant : A Quantity that can not be change, It is a fixed value in a function or equation. Ex: 2 , 3 …
Average : It is the moderate value between maximum and minimum values.
Example: 1) There is three kids having 18 biscuits —- Average sharing = 18/3 = 6 biscuits/ 1kid.
2)Bike rider traveling with average speed that is 40 km/hr.
3) The taste is average.
4) The movie is average.
5) Average diameter of the sphere is = sum of measurements/ no. of measurements
HOMOGENEITY: Addition and Subtraction can possible between two physical quantities when only they corresponds to similar type.
in mathematics —- 7 + 3 = 10 valid answer, but in physics it is not possible and there is question, what is 7 and what is 3 ? in physics sense 7 kg + 3 kg = 10 kg is valid answer, whereas 7kg+3sec = not valid (not possible).
MULTIPLICATION & DIVISION: There is NO any specific rules to these. It can possible between any two quantities.
