SOLUTION: Granny Day has signed up for a new cell phone plan! She hs decided to get with the current world and learn to text! For the plan she chose, her monthly cost is \$ 22.00 plus \$ .75 f

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 Question 527252: Granny Day has signed up for a new cell phone plan! She hs decided to get with the current world and learn to text! For the plan she chose, her monthly cost is \$ 22.00 plus \$ .75 for each text messages over 150 text messages. What equation could be used to determine the total cost of her monthly cell phone bill, y, if she sends x text messages? What I have done... Y= .75(x-150)+22 but my teacher says it is wrong because if she uses less than 150 text messages they would not pay her. I have also thought of using ((x-150)>150).75)+22 meaning if it is greater than do the next step but if not you just have it as \$22. Or f(x<150)=22 f(x>150)= .75(x-150)+22 I would be greatly honored if you would help me.Answer by stanbon(57219)   (Show Source): You can put this solution on YOUR website!Granny Day has signed up for a new cell phone plan! She hs decided to get with the current world and learn to text! For the plan she chose, her monthly cost is \$ 22.00 plus \$ .75 for each text messages over 150 text messages. What equation could be used to determine the total cost of her monthly cell phone bill, y, if she sends x text messages? ---- Make it a piecewise-defined function: Cost = \$22.00 .........., 0<= x <=150 .....= \$22.00 + 0.75x .., x > 150 ====================== Cheers, Stan H.