Anumber should be rounded up if
a. it is the first digit
b. the number after it is between 0 andha
c. the number after it is between 5 and 9
d. it is the last digit
select the best answer from the choices provided

C) the number after it is between 5 and 9

before, trains worked using the steam engine. thus, it uses heat so it is crucial to apply heat balance. the steam engine absorbs energy during the stage of boiling water. so, this is the endothermic reaction. when the steam is used to work the piston, it has to release this energy through running the train. the excess energy is released as an exhaust to the chimney. this is the exothermic process because it releases energy to the surroundings.