Price demand function to revenue function

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I'm having a little bit of trouble figuring this out, I found the price demand function in the previous question, based on that I am supposed to find the revenue function. I am a bit confused by the wording and what I should do.

Isn't this the revenue already based on the correlation between price and demand. See picture attached for the first question that I sovled.

Thanks so much for your help

first question process

prompt1

prompt2