I can not read Spanish. Sorry
First off, if it's mixed, you'd want to convert it to "improper" first, and then do the division... say hmm - 3 and 1/7

the line over the decimal part is because is a "recurrent decimal", or repeating one.
Answer: -8 degrees C.
Step-by-step explanation:
if you hear the what is the difference then you know you'll subtract:)
-20 - -12 = -8 degrees C.
77.20 i think i did it in my head and with a caluclator
Answer:
$108 ~ $110
Step-by-step explanation:
There are about 4.345 weeks in a month so:
$25 x 4.345
so about $108