1. Explain what it means when a correlation has anr²value of .72.
2. 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.
3. Is the equationy= 10 + 5x- 3x²linear? Why or why not?
4. 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