When the products of a reaction have more energy than the reactants:
the reaction is exothermic.
the reaction is endothermic.
the reactants gave up energy.
the δh is positive.

When the products of a reaction have more energy than the reactants, the reaction is endothermic.  Since the products have more energy than the reactants, we know that the reactants had to get energy from the surroundings which means the ΔH is positive meaning the reaction is endothermic.

I hope this helps.  Let me know in the comments if anything is unclear.

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 .

A1 a 2 a 3 ooh lol i think that's it