The temperature C of a fresh cup of coffee t minutes after it is poured is given by C = 125e 0.03t +68 degrees Fahrenheit. (a) Make a graph of C versus t. 200 200 180 180 160 160 140 140 120 120 C 100 C 100 80 80 60 60 40 40 20 20 0 20 40 60 80 100 120 140160180 200 220 240 20 40 60 80 100 120 140 160 180 200 220 240 t 200 200 180 180 160 160 140 140 120 120 C 100 C 100 80 80 60 60 40 40 20 20 0 20 40 60 80 100 120 140160180 200 220 240 0 20 40 60 80 100 120 140160 180 200 220 240 t (b) The coffee is cool enough to drink when its temperature is 135 degrees. When will the coffee be cool enough to drink? (Round your answer to two decimal places.) X min (c) What is the temperature of the coffee in the pot? (Note: We are assuming that the coffee pot is being kept hot and is the same temperature as the cup of coffee when it was poured. Round your answer to the nearest degree.) 193 °F (d) What is the temperature in the room where you are drinking the coffee? (Hint: If the coffee is left to cool a long time, it will reach room temperature. Round your answer to the nearest degree.) ४ °F Need Help? Read It Talk to a Tutor Tiplyashin Anato y/Shutterstock.com 8

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Percentage

A percentage is a number indicated as a fraction of 100. It is a dimensionless number often expressed using the symbol %.

Algebraic Expressions

In mathematics, an algebraic expression consists of constant(s), variable(s), and mathematical operators. It is made up of terms.

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Numbers are some measures used for counting. They can be compared one with another to know its position in the number line and determine which one is greater or lesser than the other.

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Before we begin to understand the subtraction of algebraic expressions, we need to list out a few things that form the basis of algebra.

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Before we begin to understand the addition of algebraic expressions, we need to list out a few things that form the basis of algebra.