Sam makes $400 per week plus $20 commission oh each new cell phone plan she sells. write an equation to determine how many new plans she sold to earn $680 last week.

To write the equation, you can start with the answer of $680. She receives $400 + $20*plans sold: 400 + 20p = 680 20p = 280 p = 14 {$400 + $20 * 14 = 680} Sam sold 14 plans to make a total of $680.

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