27 - What makes you think this is Rational.pdf

27 - What makes you think this is Rational.pdf - Name...

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Name: __________________________ Rational expressions What makes you think this is Rational? Rational expressions are fractions with one or more variables in the denominator and possibly one or more variables in the numerator. These expressions are worked in the same manner as fractions that do not have variable(s) in them. Applications: 1. When an engineer designs a highway curve, how does he know if it will be safe for the cars that use it? Formula for the radius (R) of a curve with a banking elevation or slope (m): 1600 ( ) 15 2 R m m = + 2. How does your camera know when the object you are trying to take a picture of is in focus? Formula for the distance (D) to the object while knowing the focal length (F) and the distance (S) from the lens to the film: 1 1 1 S F D = 3. It normally takes Julius 2 hours to mow the yard, but because he is in a hurry he asks his son to help him. If just his son was doing the yard work it would take him 3 hours. How long will it take if both are working together? Formula for finding the time it takes to do
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