Solve the problem.

When making a long distance call from a certain pay phone, the first three minutes of a call cost $1.10. After that, each additional minute or portion of a minute of that call costs $0.30. Use an inequality to find the number of minutes one can call long distance for $4.70.
A) 15 minutes or fewer
B) 4 minutes or fewer
C) 12 minutes or fewer
D) 16 minutes or fewer

Question

Solve the problem.

When making a long distance call from a certain pay phone, the first three minutes of a call cost $1.10. After that, each additional minute or portion of a minute of that call costs $0.30. Use an inequality to find the number of minutes one can call long distance for $4.70.
A) 15 minutes or fewer
B) 4 minutes or fewer
C) 12 minutes or fewer
D) 16 minutes or fewer

anonymous · Answer

3(x+.30)=4.70?

hero · Answer

It says to use an inequality

anonymous · Answer

eww! lol k

hero · Answer

From where did you get that formula? Did you make that up?

anonymous · Answer

yeah i like trying to put them together in differn orders not even close huh?

hero · Answer

No because you need to basically use graph paper to do this. You need to plot the points
(3, 1.10) and (4, 1.40) then use y = mx + b again.

hero · Answer

I'm not even going to do anything else. You need to figure this out yourself.

anonymous · Answer

so is the slope-30/1

anonymous · Answer

um no its to hard

hero · Answer

Hardly:

y = mx + b
1.10 = 3m + b
1.40 = 4m + b

b = 1.10 - 3m
b = 1.40 - 4m

b = b
1.10 - 3m = 1.40 - 4m

4m - 3m = 1.40 - 1.10
          m = .30

b = 1.10 - 3m
b = 1.10 - 3(.30)
b = 1.10 - .90
b = .20

y = .30x + .20

hero · Answer

Now we need to find the number of minutes you can call for 4.70. To do that you have to make an inequality

hero · Answer

4.70 ≥ .30x + .20
4.70 - .20 ≥ .30x
4.50 ≥ .30x
4.50/.30 ≥ x
15 ≥ x

hero · Answer

So 15 min or fewer

hero · Answer

You seem to be in disbelief regarding the simplicity of this problem.

anonymous · Answer

no im just extremely exhuasted i know these its just i cant remember Im takinga  pretest so i can get in to my midterms at the school. I have 76 math problems. and I need a 70 to pass I took it once and failed so now im here trying to pass it so i can take the darn test

hero · Answer

You cannot guess these things. You have to learn the concepts or else you will fail everytime.

anonymous · Answer

i need to know if they are right

anonymous · Answer

i do its just  i have a science test to study for to and my children are sick im sick i just want to get it over with

hero · Answer

It's not like I have plenty of free time on my hands either. I'm actually taking a break from the work I have to do. I can't do 76 problems.

anonymous · Answer

i know im not asking and i really do appreciate your help