cell phone company Y charges a $10 start up fee plus $0.10 per minute, x. Cell phone company Z charges $0.20 per minute, x, with no start up fee. Which function represents the difference in cost between company Y and company Z?
A.) f(x) = -0.10x-70
B.) f(x) = -0.10x+10
C.) f(x) = 10x-0.10
D.) f(x) = 10x+0.10

Function that represents the difference in cost between company Y and company Z is [tex]f(x)=-0.10x+10[/tex]Given :Cell phone company Y charges a $10 start up fee plus $0.10 per minute, x.Lets frame equation for each company Company YCharge y = cost per minute (x) + initial start up fee[tex]y=0.10x+10[/tex]Cell phone company Z charges $0.20 per minute, x, with no start up fee[tex]y=0.20x+0[/tex]Now we write the difference in cost Subtract the cost to find the difference in cost[tex]f(x)=0.10x+10-0.20x\\f(x)=-0.10x+10[/tex]Function represents the difference in cost between company Y and company Z is [tex]f(x)=-0.10x+10[/tex]Learn more : brainly.com/question/16744057

B.There is a 10 cent difference in the cost per minute, which is where the -.10x comes from. There is also a 10 dollar difference in the start up fees, which gives you the +10. So, if you were to choose Cell phone company Z, you would lose 10 cents per minute, but save gain 10 dollars at the beginning. -10x+10