If a completely full 5-gallon water jug is drained through a spigot, the depth is given by the formula below where t is the time, in minutes, that the spigot is open and D is the depth, in inches, above the spigot. D = 0.265t2 − 4.055t + 15.5     When will the water jug be completely drained? (Round your answer to two decimal places.)

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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.