Consider all below functions are from $R \rightarrow R$
Determine whether these functions are one-to-one, and onto.
(a)$f(x)=-3x+4$ -->Bijection
(b)$f(x)=-3x^2+7$-->Not one-to-one and not onto
(c)$f(x)=\frac{x+1}{x+2}$--->one-to-one but not onto
(d)$f(x)=x^5+1$--->Bijection
Are my answers correct.?