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Evaluating expressions with variables: temperature

CCSS.Math: ,

Video transcript

Express 25 degrees Celsius as a temperature in degrees Fahrenheit using the formula Fahrenheit or F is equal to 9/5 times the Celsius degrees plus 32 so they're telling us that we have 25 degrees Celsius so we could put that in for C here and we'll get the temperature in Fahrenheit degrees so let's do that so we'll get F is equal to 9 over 5 times now for C we're going to put in 25 times 25 plus 32 and now we can simplify this before we multiply 25 times 9 remember this is the same thing as 9 fifths times 25 over 1 we can essentially divide the numerator and the denominator of our eventual product by 5 if we divide 25 by 5 we get 5 if we divide 5 by 5 we get 1 so this boils down to 9 times 5 plus 32 so our fahrenheit degrees are going to be 9 times 5 is 45 plus 32 degrees or it's equal to 45 plus 32 is 77 so this is 77 degrees Fahrenheit