Hello,

can someone please help me the following questions:

1. How do I prove this eaulity? or I do I refute this claim?

R∘(S∪T) = (R∘S)∪(R∘T)

2. xRy ⇔ 8|(x+7y) , ∀x,y∈ℤ

what are the equivaliance classes and what is the divison of ℤ according to this relation?

Thank you!