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

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

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.

Let f be function f:N to N be defined by f(x)=3x+2, xin N . Find the images of 1, 2, 3

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

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

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