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Please show code and comment explicitly! Thank you! Develop a MATLAB code to add dB levels of signals of the same frequency as a function

Please show code and comment explicitly! Thank you!

Develop a MATLAB code to add dB levels of signals of the same frequency as a function of 2ft and plot curves for constant |SPL1-SPL2|=0,3,6,9 dB. Plot results on a single graph and give each line a different linetype, and label each line. Marks will be given for formating.

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