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Let f(x) = 5/x and g(x)=2x2+5x. what two numbers are not in the domain of f o g

1.based of the diagrams what is the the value of x? 2.how would you verify your answer for x

The spanish club held a car wash to make money. the equation y=5x represents the amount of money y club members made for washing x cars. identify the constant of proportionality. then explain what it represents in this situation