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Kryger [21]
3 years ago
15

a cell phone company charges $40 per month for unlimited calling, and $0.20 per text message sent. if f represents the number of

text messages roxy sent last month, which expression represnts the cost of her bills last month before any taxes or additional fees?
Mathematics
2 answers:
Svetlanka [38]3 years ago
6 0
Okay Adiara- 

You have to pay $40 for the calling. So even if you don't text anyone (yeah right), you'd have to pay the $40. 

Now for those texts- $.10 each. But how many are you going to text? 5? 500? 50,000? We don't know just yet so we have to use a variable...let's call it t for texts. Each text costs $.10. In math, "each" means multiply. $.10 multiplied by the number of texts you send. 



Now we need to put those together- the $40 for calling and the $.10 * t for the texts. Put together...combine...ADD!

40 + .10t

Make sense?
ankoles [38]3 years ago
3 0
The expression would be $0.20 x f. Once you figure out what the 'f' variable stands for, you have to multiply it by $0.20, and you will have your answer.
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Answer:

a)This solution matches with the original equation and its solution

b)This solution matches with the original equation and its solution

c)This solution <em><u>does not</u></em> match with the original equation and its solution. Though the solution is correct the original given equation cannot be used.

d)This solution <em><u>does not</u></em> match with the original equation and its solution. Though the solution is correct the original given equation cannot be used.

Step-by-step explanation:

i) Which scenarios can be solved by 1.5x +  2.25 = 12.75. Select all that apply and note the given solution.

therefore 1.5x = 10.5   therefore x  = 7

a) let the number be x

   therefore if \frac{3}{2} x + \frac{9}{4}  = \frac{51}{4}  \Rightarrow  1.5x + 2.25 = 12.75  then the number x = 7.

 This solution matches with the original equation and its solution

b.) If a taxi driver charges a flat fee of $2.25 and $1.5 per mile, where the

     number of mile = x, then the number of miles Juan can ride the taxi for

     $12.75 is x = 7.

This solution matches with the original equation and its solution

c)if nine quarters of a number, say x, increased by three halves is fifty one

   quarters, the number is x = 5,

   \frac{9}{4} x + \frac{3}{2}  = \frac{51}{4}  \Rightarrow  9x = 51 - 6 = 45 \therefore x = 5

This solution <em><u>does not</u></em> match with the original equation and its solution. Though the solution is correct the original given equation cannot be used.

d.)   If a taxi driver charges a flat fee of $1.5 and $2.25 per mile, where the

     number of mile = x, then the number of miles Juan can ride the taxi for

     $12.75 is x = 5.

2.25x + 1.5  = 12.75  \Rightarrow  9x = 51 - 6 = 45 \therefore x = 5

This solution <em><u>does not</u></em> match with the original equation and its solution. Though the solution is correct the original given equation cannot be used.

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