For each of the following determine whether the relation on the given set is reflexive, symmetric, transitive, and an equivalence relation (where ⇐⇒ means if and only if). Justify each of your answers (with proof or counterexamples).

1. R={(f, g)|f(1)=g(1)}on the set A={f|f:Z→Z}
2. R={(f, g)|f(0)=g(0)or f(1)=g(1)}on set A={f|f:Z→Z}
3. ((a, b),(c, d))∈R⇐⇒a+d=b+c on A=Z×Z
4. xRy⇐⇒x−y ∈ Z on A=R

Answer soon(fast) 15 pts-brainliest? for right answer with small explination a restaurant catered a party for 40 people. a child’s dinner (c) cost $11 and an adult’s dinner (a) cost $20. the total cost of the dinner was $728. how many children and adults were at the party? use the table to guess and check.(i couldn't get the graph onto the question)                                8 children and 32 adults9 children and 31 adults10 children and 30 adults12 children and 28 adults

Can someone pls ! pls answer all. no explanation needed..

Which expression converts 45 degree to radians