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anonymous

  • one year ago

An underground mine elevator descends 12% of the total depth every minute. The total depth of the elevator is 75 meters below the ground. How many meters below the ground is the elevator after 2 minutes? A: -18 meters B: -9 meters C: -4.5 meters D: -22.5 meters

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  1. anonymous
    • one year ago
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    @vera_ewing can you please help me :) Please?

  2. mathstudent55
    • one year ago
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    If it descends 12% of the total length in 1 minute, how much percent does it descend in 2 minutes?

  3. anonymous
    • one year ago
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    24% @mathstudent55

  4. mathstudent55
    • one year ago
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    Correct. Now you need to find what 24% of 75 meters is.

  5. mathstudent55
    • one year ago
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    What is 24% of 75 = ? To find a percent of a number, divide the percent by 100 and multiply by the number. 24% of 75 = = 24/100 * 75 = 0.24 * 75

  6. anonymous
    • one year ago
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    which is 18?

  7. anonymous
    • one year ago
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    @mathstudent55

  8. anonymous
    • one year ago
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    so its -18?

  9. jim_thompson5910
    • one year ago
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    Correct. It descends 9 m every min, so after 2 min, it's at the -18 m mark.

  10. anonymous
    • one year ago
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    Thank you Guys Soooooo much I r eally Apreciate it :) @mathstudent55 @jim_thompson5910

  11. jim_thompson5910
    • one year ago
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    no problem

  12. mathstudent55
    • one year ago
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    Yes, since 24% of 75 m is 18 m, it descends 18 m in the first two minutes. Since it is descending, it is losing altitude, so you can call the displacement -18 m. (Strictly speaking, the way the question was asked, the answer should be 18 m, not -18 m, but you don't have such a choice.)

  13. mathstudent55
    • one year ago
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    You're welcome.

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