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anonymous

  • one year ago

help!

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  1. anonymous
    • one year ago
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    @Michele_Laino

  2. anonymous
    • one year ago
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    Remo needs to buy a countertop for a bathroom. He calculated the area as 10 square feet. The actual area is 9.5 square feet. What is Remo's percentage error? 0.5% 0.95% 5% 5.26%

  3. Michele_Laino
    • one year ago
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    by definition, the percentage error, is: \[\large \frac{{10 - 9.5}}{{9.5}} \cdot 100 = ...?\]

  4. anonymous
    • one year ago
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    90

  5. Michele_Laino
    • one year ago
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    I'm sorry, it is wrong

  6. anonymous
    • one year ago
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    5.26315789474

  7. anonymous
    • one year ago
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    D?

  8. Michele_Laino
    • one year ago
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    correct! 5.26%

  9. anonymous
    • one year ago
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  10. Michele_Laino
    • one year ago
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    here is the general definition, for percentage error \epsilon: \[\Large \varepsilon = \frac{{{\text{measured value}} - {\text{actual value}}}}{{{\text{actual}}\;{\text{value}}}} \cdot 100\]

  11. Michele_Laino
    • one year ago
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    the requested unit rate is: space/time, namely: \[\huge r = \frac{{3/8}}{{3/5}} = \frac{3}{8} \cdot \frac{5}{3} = ...?\]

  12. anonymous
    • one year ago
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    15 / 24

  13. Michele_Laino
    • one year ago
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    you can simplify your fraction please

  14. anonymous
    • one year ago
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    5/8

  15. Michele_Laino
    • one year ago
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    correct!

  16. anonymous
    • one year ago
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    A?

  17. Michele_Laino
    • one year ago
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    yes!

  18. anonymous
    • one year ago
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    A package of pencils cost $6.25 per set at an office supply store. Which equation can be used to determine the price, P, of n sets of these pencils? n = 6.25P P = 6.25n n equals 6.25 over P P equals 6.25 over n

  19. Michele_Laino
    • one year ago
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    total cost for n set is: cost for one set multiplied by the number of set

  20. anonymous
    • one year ago
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    b?

  21. Michele_Laino
    • one year ago
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    correct!

  22. anonymous
    • one year ago
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    An oil company fills 1 over 12 of a tank in 1 over 4 hour with gasoline. At this rate, which expression can be used to determine how long will it take for the tank to fill completely? 1 over 4 ⋅ 1 over 12 1 over 12 ⋅ 4 1 over 4 ⋅ 12 12 ⋅ 4 @Michele_Laino

  23. Michele_Laino
    • one year ago
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    the filling rate r is: \[\Large r = \frac{{1/12}}{{1/4}} = \frac{1}{{12}} \cdot \frac{4}{1} = ...?\]

  24. anonymous
    • one year ago
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    4/12 which can be simplified to 1/4

  25. Michele_Laino
    • one year ago
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    4/12 which can be simplified to 1/3

  26. anonymous
    • one year ago
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    oh sorry its 1/3

  27. Michele_Laino
    • one year ago
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    that means I am able to fill 1 tank every 3 hours, right?

  28. anonymous
    • one year ago
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    right

  29. Michele_Laino
    • one year ago
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    so what is the right option?

  30. anonymous
    • one year ago
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    c?

  31. Michele_Laino
    • one year ago
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    correct!

  32. anonymous
    • one year ago
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    Which unit rate is equivalent to 19 miles per gallon? three gallons over fifty seven miles fifty seven miles over three gallons thirty seven miles over four gallons four gallons over thirty seven miles

  33. Michele_Laino
    • one year ago
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    hint: \[\Large \frac{{19}}{1} = \frac{{19 \times 3}}{{1 \times 3}} = ...?\]

  34. anonymous
    • one year ago
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    57/3

  35. anonymous
    • one year ago
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    @Michele_Laino

  36. anonymous
    • one year ago
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    b?

  37. Michele_Laino
    • one year ago
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    correct!

  38. anonymous
    • one year ago
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  39. anonymous
    • one year ago
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    b?

  40. Michele_Laino
    • one year ago
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    correct!

  41. anonymous
    • one year ago
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  42. anonymous
    • one year ago
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    true?

  43. Michele_Laino
    • one year ago
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    hint: \[\Large \begin{gathered} 8 = 2 \cdot 4 \hfill \\ 12 = 3 \cdot 4 \hfill \\ 16 = 4 \cdot 4 \hfill \\ 20 = 5 \cdot 4 \hfill \\ \end{gathered} \]

  44. anonymous
    • one year ago
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    8 12 16 20

  45. Michele_Laino
    • one year ago
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    I know, lol

  46. anonymous
    • one year ago
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    oh ok

  47. Michele_Laino
    • one year ago
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    are those numbers proportional each to others?

  48. anonymous
    • one year ago
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    yes

  49. Michele_Laino
    • one year ago
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    so, what is the right option?

  50. anonymous
    • one year ago
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    true

  51. Michele_Laino
    • one year ago
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    that's right!

  52. anonymous
    • one year ago
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  53. Michele_Laino
    • one year ago
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    hint: (0,0) means that 0 fine is due if the DVD is returned by the due date

  54. anonymous
    • one year ago
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    c?

  55. Michele_Laino
    • one year ago
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    yes!

  56. anonymous
    • one year ago
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    Silva set up a dog-walking business. He earned $60 in June. He is projected to earn 110% more in July. How much is Silva projected to make in July? $126 $170 $176 $660

  57. Michele_Laino
    • one year ago
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    it is simple, the requested amount of money is: \[\Large 60 + \left( {\frac{{110}}{{100}} \cdot 60} \right) = ...?\]

  58. anonymous
    • one year ago
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    i got A

  59. Michele_Laino
    • one year ago
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    that's right!

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