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anonymous

  • one year ago

A standard showerhead in Sonia's house dispenses 12 gallons of water per minute. Sonia changed this showerhead to an energy-saving one. The equation shows the amount of water dispensed, y, as a function of the number of minutes, x, for the new showerhead. y = 3x How much water does Sonia save each day with the change in showerheads if she uses the shower for 8 minutes each day? 9 gallons 17 gallons 72 gallons 93 gallons

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  1. anonymous
    • one year ago
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    please help me

  2. DanJS
    • one year ago
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    The old shower uses \[\frac{ 12 ~gal }{ 1~\min }*\frac{ 8~\min }{ 1 ~day } = \frac{ 12*8 ~gal }{ day }\]

  3. anonymous
    • one year ago
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    ok

  4. DanJS
    • one year ago
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    Use the function to find the gallons per day for the new one... 8 min per day = x Gallons used by new shower = 3 * x

  5. DanJS
    • one year ago
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    So the new one uses 25 gallons each day if used for 8 min per day ... the difference between the old and the new is the answer they want

  6. DanJS
    • one year ago
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    24 gallons, sorry , not 25

  7. anonymous
    • one year ago
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    ok i understand it now

  8. DanJS
    • one year ago
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    Water saved each day = (Old shower rate) - (New Shower Rate) =

  9. DanJS
    • one year ago
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    k

  10. anonymous
    • one year ago
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    wait

  11. DanJS
    • one year ago
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    ya

  12. anonymous
    • one year ago
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    24-12=12 but 12 isnt one of the answer choices

  13. DanJS
    • one year ago
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    Old shower rate = (12*8) = 96 gal/day New Shower Rate = 3*8 = 24 gal/day

  14. anonymous
    • one year ago
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    oooooooooooooooooh

  15. anonymous
    • one year ago
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    so its 96-24

  16. DanJS
    • one year ago
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    Yes

  17. anonymous
    • one year ago
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    ok thanks

  18. DanJS
    • one year ago
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    If you dont know to multiply or divide, Look at the first thing i typed and notice how the units cancel to give you what you are looking for, gal/day

  19. DanJS
    • one year ago
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    welcome

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