Please help, Need MATLAB code to do the following. I will upvote and thanks for your help.

Apply a gain of $5$ dB to the signal in part $2.$b$.$ You will multiply all the samples of the signal by a

constant, so that the energy of the new signal is $5$ dB higher than the energy of the original. $($Hint:

$log10().$ Plot the original and the new signal on the same plot using different colors or line styles.

Write the values of the signal you produced in part $8$ to a file named lab$2$p$9.$txt$,$ in ASCII format.

View the file in a text editor. $($Hint: save$())($b$)x(t)=e^{-t}u(t)+e^{-t}[e^{2t-4}-1]u(t-2)-e^{t-4}u(t-4)$