The cost of mailing a DVD in an envelope by express mail is equal to the cost of mailing a DVD in a box by priority mail. What is the weight of the DVD with its packing material? Round your answer to the nearest hundredth.
  Packing  Material    Priority Mail   Express Mail
Box=   $2.25   $2.50 per lb    $8.50 per lb
Envelope= $1.10    2.50 per lb    $8.50 per lb

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Mathematics

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The cost of mailing a DVD in an envelope by express mail is equal to the cost of mailing a DVD in a box by priority mail. What is the weight of the DVD with its packing material? Round your answer to the nearest hundredth.
  Packing  Material    Priority Mail   Express Mail
Box=   $2.25   $2.50 per lb    $8.50 per lb
Envelope= $1.10    2.50 per lb    $8.50 per lb

Sagot :

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Alexizid Alexizid · Answer 1

Alexizid Alexizid

eight of the DVD with packing material is 0.19 lb.
1.10+8.5x=2.25+2.5x
Move variables to one side. The easier one would be to move 2.5x. So you subtract 2.5x to both sides.
1.10+6x=2.25
Do the same for the values without the x. The easier one would be to subtract 1.10 from both sides.
6x=1.15
Then divide by 6
1.15/6=0.19

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