If `f : N to N` is defined as `f(x) = 2x+5`, is f onto?

If f:N rarr N is defined by f(x)=2x+5 then f is

Consider the following statements : 1. A function f:Z to Z , defined by f(x) = x+1 , is one-one as well as onto. 2. A function f:N to N , defined by f(x) = x +1 , is one-one but not onto. Which of the above statements is/are correct?

If f: N to N defined as f(x)=x^(2)AA x in N, then f is :

Let f : N rarr N be defined as f(x) = 2x for all x in N , then f is

Let f : N rarr N be defined as f(x) = 2x for all x in N , then f is

Show that the function f : N to N defined by f(x) = x^(2), AA x in N is injective but not surjective.

Show that the function f:N to N defined by f(x)=2x-1 is one-one but not onto.

Prove that the function f:N to N , defined by f(x)=x^(2)+x+1 is one-one but not onto.