Determine if the equation y = 2 (0.4) x represents exponential growth or decay.

Te way you wrote your equation is confusing & as it is cannot be an exponential function unless it is written as follows:

either y = 2^ (0.4) x or y=2^ (0.4) ^x

In the first case it's growing as x grow

in the second case is decaying as x is growing.

In this format, we can either use latex or enter a "^" to show that we are raising something to a power ...

y=2 (0.4) ^x

This is exponential decay because the rate is less than 1, in this case 0.4.

All exponential functions can be expressed as:

F=Ir^t, F=final amount, I=initial amount, r=rate, t=time