Suppose P is a partition of a set A. Define a relation R on A by declaring x~_R y if and only if x, y ∈ X for some X ∈ P. Prove R is an equivalence relation on A. Then prove that P is the set of equivalence classes of R.

i am not sure :

step-by-step explanation:

it is 28 degrees colder in detroit than philadelphia.

step-by-step explanation:

what number adds to 21

-7 + ? = 21

-7 + 28 = 21

hope it

can you take a photo of the screen?

1. 16.64

a^2+b^2=c^2

pr^2=pq^2+qr^2

pr^2=14^2+ 9^2

pr^2=196+81

pr= sqr root of 277

16.64

2. 11.31

c^2-a^2=b^2

18^2- 14^2=b^2

b^2=324-196

b=sqr root of 126

b=11.31

hope it ! (btw im in connections academy to, good luck! )