Aplumber charges $70 per hour plus $40 for the call. what does he charge for 4 hours of work

The answer is $320.

In order to solve this, you can start off by turning this word problem into an expression.

$70x → $70 per hour (x represents the amount of hours)

+40 → plus $40 for the call

Substitute the x for 4 and solve the equation.

70x+40

70(4)+40

280+40

320

The plumber charges $320 for 4 hours of work.

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