mrs. santiago is buying doughnuts for her office. each box contains 6 glazed, 4 cream filled, and 2 chocolate flavored doughnuts. if there were 20 total cream filled doughnuts, how many chocolate doughnuts did she buy?

18.75 gallons

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guess at question:

a vertical line intersects the graph of g(x,y) = 0 at two points. what conclusion follows about the function f(x) implicitly defined by g(x,f(x)) = 0?

the domain of f(x) cannot include the x coordinate of any such vertical line.

informally, f(x) is not a function, and

g(x,y)=0 cannot be solved for y uniquely.

the relation r = {(x,y) such that g(x,y) = 0} is a function if

for all (a,b) ∊ r and (c,d) ∊ r, a=c implies b=d.

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