Athermometer shows a temperature of -20 3/4 degrees. a chemist recorded this temperature in her notebook using a decimal. which number did the chemist write in the notebook

To find the answer use this: 20 3/4 (chemist wrote 20.75) so it equals  -77/4 =-19.25
What's showing up there is simplifying the fraction.

So the answer to the problem would be -19.25 degrees. 

You must find the surface of the block therefore 98187 dived by 5628 = 583m squared