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anonymous

  • one year ago

Kelsey painted one-fourth of her bedroom in three-sevenths of an hour. At this rate, how long would it take her to paint the entire room

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  1. jim_thompson5910
    • one year ago
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    We have this ratio \[\Large \frac{1}{4} \ \text{bedroom} \ : \ \frac{3}{7} \ \text{hour}\] Multiply both parts by 4 to turn the "1/4" into "4/4" which is just 1 \[\Large {\color{red}{4*}}\frac{1}{4} \ \text{bedroom} \ : \ {\color{red}{4*}}\frac{3}{7} \ \text{hour}\] \[\Large \frac{4}{4} \ \text{bedroom} \ : \ \frac{12}{7} \ \text{hour}\] \[\Large 1 \ \text{bedroom} \ : \ \frac{12}{7} \ \text{hour}\]

  2. jim_thompson5910
    • one year ago
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    12/7 = 1.714 approximately it takes roughly 1.714 hours to paint the whole room

  3. anonymous
    • one year ago
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    thanks

  4. jim_thompson5910
    • one year ago
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    no problem

  5. anonymous
    • one year ago
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    Margie calculated that she would spend $175 on school supplies this year. She actually spent $97.50 on school supplies. What is Margie’s percent of error

  6. anonymous
    • one year ago
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    77.3% 79.5% 44.2% 4.4%

  7. jim_thompson5910
    • one year ago
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    have a look at this page https://www.mathsisfun.com/numbers/percentage-error.html

  8. anonymous
    • one year ago
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    i get 72.5

  9. jim_thompson5910
    • one year ago
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    Did you use the formula \[\Large \frac{|\text{Approximate Value} - \text{Actual Value}|}{| \text{Actual Value}|}\times 100\%\] they show it on the page

  10. anonymous
    • one year ago
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    oh no i didnt

  11. jim_thompson5910
    • one year ago
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    They also posted this How to Calculate Here is the way to calculate a percentage error: Step 1: Calculate the error (subtract one value form the other) ignore any minus sign. Step 2: Divide the error by the exact value (we get a decimal number) Step 3: Convert that to a percentage (by multiplying by 100 and adding a "%" sign)

  12. anonymous
    • one year ago
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    whats the approximate value

  13. anonymous
    • one year ago
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    nvm

  14. jim_thompson5910
    • one year ago
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    it's the estimate

  15. anonymous
    • one year ago
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    i couldnt find the answer can you tell me ill give you a medal

  16. jim_thompson5910
    • one year ago
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    approximate = 175 (this is the amount she estimates) actual = 97.50 (actual amount she spends)

  17. jim_thompson5910
    • one year ago
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    does that help?

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