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What is the first step of an indirect proof of a number that is divisible by two

Given f(x)= 9x+1 and g(x)=x^3, choose the expression (f*g)(x)

Find the equation of a line that is perpendicular to line g that contains (p, q). coordinate plane with line g that passes through the points negative 3 comma 6 and 0 comma 5 3x − y = 3p − q 3x + y = q − 3p x − y = p − q x + y = q − p