Using Table 7-1 as a guide, predict which member of each pair is more stable, and by

Question:

Using Table 7-1 as a guide, predict which member of each pair is more stable, and by about how many kJ mol or kcal mol.
(a) cis,cis-hexa-2,4-diene or trans,trans-hexa-2,4-diene
(b) 2-methylbut-1-ene or 3-methylbut-1-ene
(c) 2-methylbut-1-ene or 2-methylbut-2-ene
(d) 2,3-dimethylbut-1-ene or 2,3-dimethylbut-2-ene