Vanya, a newborn going through a growth spurt, grew out of an average of 250 socks per month from january to march, inclusive. he grew out of an average of 300 socks per month in april and may. find the average amount of socks vanya grew out of during the 5 months.

a = 11 : 4

b = 38

c = 1 for every 6

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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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