Plumber A charges an initial call fee of $50 and an additional $30 for every hour of labor the job requires. Plumber B charges a flat rate of $40 per hour of labor. Write an equation in the form y = mx + b that represents the total charge (y) for (x) the number of hours a job takes for Plumber A.

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it is contrapositive

i could not see the question too well so check yourself again too . this is because i want you to get it correct.

1260=3*6*7*10=3^2*2^2*7*5 perfect cude = 3^3*2^

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