Answer :
None of them are linear
Y = |x| is a absolute value
Y= 2^x is an exponential
Y= 1/3^x is an exponential
X^2+5=y is a quadratic
Y = |x| is a absolute value
Y= 2^x is an exponential
Y= 1/3^x is an exponential
X^2+5=y is a quadratic