State whether the following contracts are valid, unenforceable or illegal.

a) sam pays $10,000 to dispose of his mother-in-law
b) ernie offers $20,000 to emilio for emilio’s block of land. emilio accepts, but nothing is signed
c) fred asks abc insurance to insure his new car. the company agrees but nothing is signed.
d) zoe agrees to lease a shop from ian for 10 years. no lease has been signed.
e) x and x are bank robbers. they employ george to drive their getaway car.