PLZ GIV EXPLANATION WITH STEPS FOR FOLLOWING QUESTIONS

1.FIND DOMAIN AND RANGE OF REAL FUNCTION F DEFINED BY F(X)=ROOT OF X-1

2 IF N(A)=N(B) THEN IS N(A-B0=N(B-A)?

3LET A={12,15,16,18,20}

AND LET F BE A FUNCTION FRO A TO N DEFINED BY F(X)={Y:Y=X/3}FIND RANGE OF X

for the first case,domain for root of x-1,is @ [1,infinity)...since if we input values lesser than 1,we will get negative value in the square root..and so the output will be imaginary.. And the range(output)[1,infinity) since root of a real number is always positve. I hope that this was correct.