Molecular formula: c19h16 double bond equivalence i. calculate the number of double bond equivalents in the molecule from the molecular formula. (1 mark) ii. what does this indicate about the molecule? (1 mark)

Is the something missing from the question

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 .

B"hf and f-"  is the correct answer took the test on edgenuity and got it right