FOR MATHMATE

posted by .

Media services charges $40 for a phone and 20/mth for its economy plan. It says to find a model that determines the total cost, C(t), of operationg a media Services phone for t months. I think the answer should be in this equation - y = mx+b. Not sure.



Algebra/Equations,functions - MathMate, Friday, November 26, 2010 at 11:34am
So far so good.

What values would you assign to m and b to complete the operation model?



Algebra/Equations,functions - AMY, Friday, November 26, 2010 at 12:47pm
y = 40x+20?



Algebra/Equations,functions - MathMate, Friday, November 26, 2010 at 1:33pm
Correct!



Algebra/Equations,functions - MathMate, Friday, November 26, 2010 at 1:35pm
Watch out, it's $20/month and the phone (one time only) is $40.
so the equation should be:....




Algebra/Equations,functions - AMY, Friday, November 26, 2010 at 5:19pm
not sure but will take a stab at it. y = 20x +40?



Algebra/Equations,functions - AMY, Friday, November 26, 2010 at 6:44pm
Nope that was wrong on my part. I believe the final answer is C(t) = 20t+40



Algebra/Equations,functions - AMY, Friday, November 26, 2010 at 7:55pm
I also need to find the total cost. This is what I have.

C = 20(0) +40. (0,40).
C (5) = 20 (5) + 40.
C (5) = 100 +40 = 140 (5, 140)
So the total cost is 130. IS THIS RIGHT? Thank you!

  • FOR MATHMATE -

    Thank you for the follow-up. Sorry that I didn't check your responses.

    Yes, in a function, we normally assume that
    C(x)=ax+b
    is equivalent to
    C(t)=at+b
    because t is a "dummy" variable.

    However in your case, t has been stated as the variable, so it is more correct to define function as:
    C(t)=20t+40

    Hope you understood fully why $20 per month is associated with the variable t.

  • FOR MATHMATE -

    Yes. DId you see the total cost?? Was I right with the answer to that one? I think I was right.

  • FOR MATHMATE -

    No, I didn't.

    But if total cost for t months,
    C(t) = 20t + 40, then
    For 0 month:
    C(0) = 20(0)+40 = 40
    for 4 months:
    C(4) = 20(4)+40 = 120
    for 5 months:
    C(5) = 20(5)+40 = 140

    I do not understand how you get 130 (for 5 months)!

    The question has not stipulated for how many months the total cost should be calculated.

Respond to this Question

First Name
School Subject
Your Answer

Similar Questions

  1. Math

    Media service charges $20 for a phone and $30/month for its economy plan. The equation c=30t +20 describes the total cost,c, of operating Media Services phone for t months. The total cost for 4 months of service is $140?
  2. algebra

    help please im on my final exam for algebra and i need to pass this is the second time taking it. media services charges $20 for a phone and $30 a month for itd economy plan. the equation c=30t+20 describes the total cost c, of operating …
  3. math-word problem

    Media Services charge $20 for a phone and $30/month for its economy plan. The equation C=30t +20 describes the total cost, C of operating a media service phone for t months. The total cost for 10 months of service is... My answer is …
  4. Math

    Media service charges $20 for a phone and $30/month for its economy plan. The equation c=30t +20 describes the total cost,c, of operating Media Services phone for t months. A) The total cost for 8 months of service is?
  5. Algebra/Word problem

    media services charges $20 for a phone and $30/month for its economy plan. what is the total cost for 10 months service C(t)= 30t +20= total cost is $500 for 10 months?
  6. math

    media service charges $30 for a phone and $20 month for its economy plan. find a model that determines the total cost,C(t) of operating a media services phone for 1 months C(t)= use the model to find the total cost for 3 months of …
  7. matt

    Media Services charge $30 for a phone and $20/month for its economy plan. The equation c=20t+30 describes the total cost, c, of operating a Media Services phone for t months. The total cost for 7 months of service is?
  8. Algebra/Equations,functions

    Media services charges $40 for a phone and 20/mth for its economy plan. It says to find a model that determines the total cost, C(t), of operationg a media Services phone for t months. I think the answer should be in this equation …
  9. Math 116

    1.Write an equation of the line containing the given points and parallel to the given line (3,8); x+5y=3 2. Write an equation of the line containing the given points and parallel to the given line (-3,6); 5x=9y+2 3. Write an equation …
  10. Math 116

    1.Write an equation of the line containing the given points and parallel to the given line (3,8); x+5y=3 2. Write an equation of the line containing the given points and parallel to the given line (-3,6); 5x=9y+2 3. Write an equation …

More Similar Questions