A cup of coffee is heated to 180°F and placed in a room that maintains a temperature of 80°F. The temperature of the coffee after t minutes is given by T(t) = 80 + 115e¬0.042€. (a) Find the temperature, to the nearest degree, of the coffee 30 minutes after it is placed in the room. 112.6 °F (b) Determine when, to the nearest tenth of a minute, the temperature of the coffee will reach 140°F. 190 x min

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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.