Answer
See below
Work Step by Step
We can write the given function as:
$f(t)=2(1-u_1(t))+2e^{t-1}u_1(t)\\
=(2e^{t-1}-2)u_1(t)+2$
You can help us out by revising, improving and updating this answer.
Update this answerAfter you claim an answer you’ll have 24 hours to send in a draft. An editor will review the submission and either publish your submission or provide feedback.