Is this correct? need help plz

What is the length of the segment joining the points at (4,5) and (6,-2) round to the nearest tenth if necessary

Arefrigeration system at your company uses temperature sensors fixed to read celsius (°c) values, but the system operators in your control room understand only the fahrenheit scale. you have been asked to make a fahrenheit (°f) label for the high temperature alarm, which is set to ring whenever the system temperature rises above –10°c. what fahrenheit value should you write on the label?

1. how do you convert the repeating, nonterminating decimal 0. to a fraction? explain the process as you solve the problem.