If 0<𝑏<1, what is the horizontal asymptote of 𝑦=𝑎𝑏^𝑡 as t→∞? Enter NONE if there is no horizontal asymptote (that is, if the

If 0<𝑏<1, what is the horizontal asymptote of 𝑦=𝑎𝑏^𝑡 as t→∞?

Enter NONE if there is no horizontal asymptote (that is, if the graph goes to ±∞ as t→∞). Otherwise enter an equation for the line that is the horizontal asymptote.

The horizontal asymptote has equation