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LUCKY_DIMON [66]
3 years ago
5

Jack chooses 15 downloads for $19.75, and jim chooses 40 downloads for $43.50. What is the regristration fee, and what is the co

st of each download?
Mathematics
1 answer:
Rina8888 [55]3 years ago
8 0
Registration fee  = x
cost of one download = y

x+15y=19.75
x+40y=43.50

      x+15y=19.75
  <span>  -(x+40y=43.50)
</span>         - 25y = 19.75-43.50

          -25y = -23.75
               y = 0.95

x+15y=19.75
x+15*0.95=19.75
x= 19.75 - 15*0.95
x=5.50

registration fee  = $ 5.50
cost of one download = $ 0.95
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3 years ago
(2) Using the distance formula, d = √(x2 - x1)2 + (y2 - y1)2, what is the distance between point (-2, 2) and point (4, 4) rounde
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Using the distance formula, d = \sqrt{(x_{2} - x_{1})^2 + (y_{2} - y_{1})^2  } \\, what is the distance between point (-2, 2) and point (4, 4) rounded to the nearest tenth?

Using the points given, plug them into the equation.

d = \sqrt{(x_{2} - x_{1})^2 + (y_{2} - y_{1})^2  } \\d = \sqrt{((4) - (-2))^2 + ((4) - (2)^2  } \\d=\sqrt{(4+2)^2 + (4-2)^2}\\d=\sqrt{(6)^2 + (2)^2}  \\d=\sqrt{36+4} \\d=\sqrt{40} \\

Plug this into a calculator and you get 6.32455532

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Since two is lower than four, we drop it.

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Hope this helps ^w^

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