For each reaction, decide whether substitution or elimination (or both) is possible, and predict the products you

Question:

For each reaction, decide whether substitution or elimination (or both) is possible, and predict the products you expect. Label the major products.
(a) 1-bromo-1-methylcyclohexane + NaOH in acetone
(b) 1-bromo-1-methylcyclohexane + triethylamine (Et3N :)
(c) chlorocyclohexane + NaOCH3 in CH3OH
(d) chlorocyclohexane + NaOC(CH3)3 in (CH3)3COH