The relation Ris defined on Z as follows: ∀ M , N ∈ Z , M R N ⟷ ∃ K ∈ Z ∣ ( M + N ) = 2 K [( M + N ) Is An Even Number]

Required:
Prove that the relation R is an equivalence relation.

Sara needs to take a taxi to get to the movies the taxi charges $4.00 for the first mile and then $2.75 for each mile after that if the total charge is $20.50 then how far was sara’s taxi ride to the movie

For how answer my question this will be the last question can you answer in math subject

The center of a circle represent by the equation (x+9)^2+(y-6)^2=10^2 (-9,6), (-6,9), (6,-9) ,(9,-6)