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This is a substitution problem. Since r=2v, you can plug that into p=r/4: p = 2v/4 = v/2.P is "in terms of" v because it's by itself, and the only other variable in the equation is v.

I got a test in a few days so please help me 1) Given that p=r/4 and r=2v. find p in terms of v