Which one is a true statement about endothermic reactions? a: more heat is given off than is put into the reaction. b : the reactants have more heat energy than the products. c: the reaction container always feels hot. d: energy is absorbed making it feel colder.

A because it gets hot

Idid the calculation and i get 875,000,000 which can be written as 8.75 x 10^6?

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 .