Hello, morelemonzanybody?

The current, amps, flowing through an electrical circuit at time seconds

is known to be decreasing according to the equation .

where is the current initially flowing.

Given that the initial current in this circuit is 2 amps,

calculate how long it takes for the current to decrease to 0.5 amps,

giving your answer in seconds correct to 2 d.p.

We are told the initial current is 2 amps.

. . So the function is: .

We are asked: When is ?

We have: .

Therefore: . seconds.