The AH value of an endothermic process that requires the absorption of energy is: a positive value, H > 0
a negative value, H<0
stays constant, H=0
lost to the surroundings

The independent variable is the type of music.the dependent variable is the pulse rate.the intervening variable is the age of the subject.if the mother does not like rock, her pulse is likely to not increase.the same might be true for the sister.the friend may like rap and gets excited.to establish cause/effect relationship, all of the subjects must be consistent.hope i .

What do you not know about it

Idon't know hope someone you

Answer:

5.6⋅10−^19  j

do you need the explaination?