Proof of lambda reductions


I am not sure how to approach this question or what exactly it is asking. Need to prove the following reductions:

Need to prove those knowing that: N = λf.λc.(f (f . . .(f c)). . .) and that: addition: + = λM.λN.λa.λb.((M a)((N a) b)) multiplication: × = λM.λN.λa.(M (N a)) exponentiation: ∧ = λM.λN.(N M)