7. A company has 20 Blu-ray players of which 6 are defective. If four are sold, what is the probability that: a. all four are good? b. all four are defective? c. at least one is defective? с. If two are sold, what is the probability that: d. the second is defective given the first is good? е. the first is good given the second is defective?

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Equations and Inequations

Equations and inequalities describe the relationship between two mathematical expressions.

Linear Functions

A linear function can just be a constant, or it can be the constant multiplied with the variable like x or y. If the variables are of the form, x2, x1/2 or y2 it is not linear. The exponent over the variables should always be 1.