-9-(-12)=-9+12=3
-9-12=-9+(-12)=-21
Twice a number (2x) decreased by 7 (- 7).
2x - 7
Two times a specfic number (x) subtracted by 7.
Answer:
between 180 and 365 cuz it's a reflex angle
According to steam tables, steam produced from liquid water at 100 deg. C and standard atmospheric pressure (101.3 kPa) is 2257.0 kJ/kg.K.
Note : this value varies greatly with pressure and temperature.
