For an exponential function, what does a negative exponent indicate?

.What is the asymptote of the graph of an exponential decay function?

What is the range of an exponential decay function? 

What is the domain of all exponential functions?

How does the graph of an exponential decay function behave as x approaches positive infinity? 

In the equation $y=ab^x$ , what does 'a' represent? 

How does the graph of an exponential growth function behave as x approaches negative infinity?

In an exponential function, what is the base of the exponent typically representing?

What is the key characteristic of the slope of the tangent line to an exponential function at any point? 

What is the effect of increasing the base in an exponential growth function?What is the asymptote of the graph of an exponential decay function?