Question 1197707
A function f(x) is odd if -f(x)=f(-x) for all values of x.
a) {{{f(-x)=3(-x)^2+5=3x^2+5=f(x)}}}
Since f(-x) does not equal -f(x), it is not odd.
b) {{{f(-x)=abs(-x-2)}}} and {{{-f(x)=-abs(x-2)}}}
{{{abs(-x-2)}}} does not equal {{{-abs(x-2)}}}, so it is not odd.
c) {{{f(-x)=cos(-x)+7=cos(x)+7=f(x)}}}
f(-x) does not equal -f(x), so it is not odd.

Therefore, none of the three functions are odd.