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monitta
3 years ago
10

Customers of a phone company can choose between two service plans for long distance calls. The first plan has a 26

Mathematics
2 answers:
love history [14]3 years ago
7 0
--------------------------------------------------------
Define x :
--------------------------------------------------------
Let the number of minutes of call be x.

--------------------------------------------------------
First Plan :
--------------------------------------------------------
26 + 0.08x

--------------------------------------------------------
Second Plan :
--------------------------------------------------------
8 + 0.13x

--------------------------------------------------------
Find x so that the costs are the same :
--------------------------------------------------------
26 + 0.08x = 8 + 0.13x
0.13x = 0.08x = 26 - 8
0.05x = 18
x = 360 minutes

--------------------------------------------------------
Answer: 360 minutes of call.
--------------------------------------------------------
Wittaler [7]3 years ago
6 0
26+0.08x=8+0.13x
26-8=0.13x-0.08x
18=0.05x
x=18/0.05=360 min
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3 years ago
Tim bought some 25 cent and some 29 cent stamps. He paid 7.60 dollars for 28 stamps. How many of each type of stamp did he buy?
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Answer:

25 cent stamps = 13 and 29 cent stamps = 15

Step-by-step explanation:

x = 25 cent stamps and y = 29 cent stamps

x + y = 28......x = 28 - y

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0.25(28 - y) + 0.29y = 7.60

7 - 0.25y + 0.29y = 7.60

-0.25y + 0.29y = 7.60 - 7

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y = 0.60 / 0.04

y = 15 <===== 29 cent stamps

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lets check it...

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0.25(13) + 0.29(15) = 7.60

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3 years ago
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