Solving problems by equations and graphs

Problems need not always be solved by equations alone. Problems that involve setting up equations can be solved using graphs also. This requires knowledge of interpreting equations in x as a function of x. This is an important knowledge as it will be handy in solving problems in calculus.  The key to the solution of…

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Ratio and probability problem

It is always assumed that a sample has all the characteristics of the population from which it is taken. For example, if it is given that the ratio of men to women in a population is 2:3 or 40% to 60%, the same will be true to the sample. Problem A survey has shown that…

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