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I got y = 10

so that's the minimum? but i don't know how to find the largest possible answer

yeah, that's correct, then solve for one of the variables and plug it into the S equation

the S equation or the S' equation?

the S equation

plug it into the S equation, simplify
then take the derivative (S')

Oh i figured it out lol!!! But i don't know how to solve for part b :(

x+sqrt(y) = M try that?

using x+y = 20
plug in, same things...?
dunno if it'll work, but....