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frez [133]
3 years ago
5

The phone company charges 10 cents to connect a call for one minute and 8 cents per minute after that. How long could you talk o

n the phone for 1 dollar?
Mathematics
1 answer:
Lunna [17]3 years ago
6 0
<span>The phone company charges 10 cents to connect a call for one minute and 8 cents per minute after that. 
We call x minute to talk after the first minute.
We have 10+8x</span>≤100 (cents)
and 8x≤100-10
or 8x≤90 and x≤90:8
and x≤11.25
So: <span>How long could you talk on the phone for 1 dollar: it is 11 minute and 15 seconds</span>
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Answer:

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  • 23 = BE
  • 13 = CE

Step-by-step explanation:

<u>We know that:</u>

  • BD = 2x - 4
  • DE = 2x - 3 - 2
  • BE = 3x - 1
  • CE = 2x - 3

<u>Solution:</u>

  • (2x - 4) + (2x - 3 - 2) = 3x - 1
  • => 2x - 4 + 2x - 3 - 2 = 3x - 1
  • => 4x - 9 = 3x - 1
  • => 4x - 3x = 9 - 1
  • => x = 8
  • => 2x - 4 = BD
  • => 2(8) - 4 = BD
  • => 16 - 4 = BD
  • => 12 = BD
  • => 3x - 1 = BE
  • => 3(8) - 1 = BE
  • => 24 - 1 = BE
  • => 23 = BE
  • => 2x - 3 = CE
  • => 2(8) - 3 = CE
  • => 16 - 3 = CE
  • => 13 = CE

Hence, the answers are:

  • x = 8
  • 12 = BD
  • 23 = BE
  • 13 = CE
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