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Mathematics 13 Online
OpenStudy (anonymous):

For his long distance phone service, Felipe pays a $3 monthly fee plus 11 cents per minute. Last month, Felipe's long distance bill was $13.23 . For how many minutes was Felipe billed?

OpenStudy (anonymous):

anyone?

OpenStudy (anonymous):

You can solve this by subtracting the 3 dollars from 13.23 and then dividing by 11

OpenStudy (anonymous):

i got a long decimal..

OpenStudy (anonymous):

12.9572727

OpenStudy (anonymous):

or 0.77?

OpenStudy (anonymous):

did you convert the dollars to cents?

OpenStudy (anonymous):

0.77 i think? right?

OpenStudy (anonymous):

So there are how many cents in 10 dollars

OpenStudy (anonymous):

ummm...

OpenStudy (anonymous):

100 cents in a dollar so 100*10=?

OpenStudy (anonymous):

1,000.

OpenStudy (anonymous):

Good. Then add 23.

OpenStudy (anonymous):

1,023.

OpenStudy (anonymous):

now divide that by 11

OpenStudy (anonymous):

93

OpenStudy (anonymous):

Exactly. So that is how many minutes he was billed.

OpenStudy (anonymous):

If you want to check your work just multiply 93 by 11 then add 3 dollars (300 cents) and convert back into dollars

OpenStudy (anonymous):

yay! :D thanks so much! you think you can help me with 1 more question? then i'll be one :)

OpenStudy (anonymous):

sure

OpenStudy (anonymous):

ok its --- Elsa received a $70 gift card for a coffee store. She used it in buying some coffee that cost $7.53 per pound. After buying the coffee, she had $39.88 left on her card. How many pounds of coffee did she buy?

OpenStudy (anonymous):

okay so first subtract 39.88 from 70

OpenStudy (anonymous):

this will give you how much money she spent on the coffee in total (not the answer you're looking for)

OpenStudy (anonymous):

so 30.12?

OpenStudy (anonymous):

yes. now divide that by 7.53 and you will have your answer!

OpenStudy (anonymous):

ahhh ok 22.59

OpenStudy (anonymous):

shoot. i meant 4.

OpenStudy (anonymous):

:P

OpenStudy (anonymous):

ugggghhh! i put 22.59 as the first answer cause I messed up. because of that they gave me another one -_-

OpenStudy (anonymous):

pls help me till I finish this thinggg. I need to get 2 in a row correct. :s

OpenStudy (anonymous):

next one is, Kaitlin purchased a prepaid phone card for $25 . Long distance calls cost 24 cents a minute using this card. Kaitlin used her card only once to make a long distance call. If the remaining credit on her card is $20.92 , how many minutes did her call last?

OpenStudy (anonymous):

does it mean that she originally has $25 on the phone and then after the call has $20.92?

OpenStudy (anonymous):

If so then first subtract 20.92 from 25 (like the last question)

OpenStudy (anonymous):

yeah I think..

OpenStudy (anonymous):

then multiply the resulting answer by 100 and then divide by 24

OpenStudy (anonymous):

this will be your answer

OpenStudy (anonymous):

so I got 17

OpenStudy (anonymous):

yep. That's what I got!

OpenStudy (anonymous):

and then, Suppose that B and C are points on the number line. If =BC19 and B lies at −5 , where could C be located? If there are several locations, separate them with commas.

OpenStudy (anonymous):

Did you mean BC=19?

OpenStudy (anonymous):

19 :p

OpenStudy (anonymous):

okay then. so take -5 and since C is 19 points away subtract 19 from -5 and also add 19 to -5

OpenStudy (anonymous):

doing this will give you the two points C could be located at

OpenStudy (anonymous):

kinda confusing O.o

OpenStudy (anonymous):

so what is -5-19

OpenStudy (anonymous):

-24

OpenStudy (anonymous):

what is -5+19

OpenStudy (anonymous):

14

OpenStudy (anonymous):

do you see how these 2 points, 14 and -24, are 19 points away from -5?

OpenStudy (anonymous):

yes

OpenStudy (anonymous):

okay so your answer is 14,-24 Don't know if there should be a space in between the comma and -24 though...

OpenStudy (anonymous):

now it tells me to grid these... hold on let me make a drawing.

OpenStudy (anonymous):

|dw:1453172353894:dw|

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