do the first one , please show work and answer fast

Answer:
Temperature at Ryan's hometown will be = -21°C
Step-by-step explanation:
Given:
Temperature in Wichita, Kansas = -3°C
Temperature at Ryan's hometown is 18°C colder than temperature in Wichita.
∴ Temperature at Ryan's hometown will be = [tex]-3\°C-18\°C=-21\°C[/tex]
[When two negatives are summed, then they add up to give sum with a negative sign]