3. bill uses his thermometer and finds the boiling point of ethyl to be 75 degrees. he looks in a reference book and finds that
the actual boiling point of ethyl is 80 degrees. what is his percent error?

6.25%

Step-by-step explanation:

Percent error is calculated by taking the difference of measured value and correct value divided by correct value and multiplied by 100%.

Mathematically,

Percent error = (correct value - measured value)/correct value  * 100%

in the problem given

measured value = 75 degrees Celsius

correct value = 80 degrees Celsius ( as given in reference book)

thus,

Percent error = (80 - 75)/80 * 100%

Percent error = (5/80 )* 100% = 6.25%

Percent error calculated by him is  6.25%.

answer: -2+√x,-2-√x

i hope this , i don't know if you're looking for a pair or not.