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Explain what it means when a correlation has anr 2 value of .72. The credit card company we use to accept payments at our donut

Explain what it means when a correlation has anr²value of .72.

The credit card company we use to accept payments at our donut shop charges $10 when a payment is late and $5 a day each day the payment remains unpaid.Find the equation that expresses the total fee in terms of the number of days the payment is late.

Is the equationy= 10 + 5x- 3x²linear? Why or why not?

Which of the following equations are linear? Explain why or why not.

a.y= 6x+ 8

b.y+ 7 = 3x

c.y-x= 8x²

d. 4y= 8

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