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emmynimmy

  • one year ago

The equation y = 35.25x + 40 gives the labor cost y of repairing a car if it takes x hours to repair the car. Which statement is true? For every hour of labor, the cost decreases by $40. For every hour of labor, the cost decreases by $35.25. For every hour of labor, the cost increases by $40. For every hour of labor, the cost increases by $35.25.

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  1. Teddyiswatshecallsme
    • one year ago
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    I believe its D.

  2. emmynimmy
    • one year ago
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    Are you sure?

  3. emmynimmy
    • one year ago
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    The equation y = 4.75x + 20 gives the cost y of towing a car if the car is towed x miles. According to the model, what is the best estimate of the cost for towing a car 22 miles? $24.75 $46.25 $104.50 $124.50

  4. Teddyiswatshecallsme
    • one year ago
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    Well its not negative so it wouldn't decline, and 40 doesn't represent the hourly cost so yeah. lol cx

  5. emmynimmy
    • one year ago
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    thanks! can you help with the other question?

  6. johnweldon1993
    • one year ago
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    \[\large y = 4.75x + 20\] where 'x' is the number of miles...so since we want to know the cost to go 22 miles we have \[\large y = 4.75(22) + 20\] \[\large y = 104.5 + 20\] \[\large y = 124.5\]

  7. Teddyiswatshecallsme
    • one year ago
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    Yeah. Briefly. The answer for the second is 104.50

  8. Teddyiswatshecallsme
    • one year ago
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    4.75(22) = 104.50

  9. johnweldon1993
    • one year ago
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    ...close...but there is a constant added after that

  10. emmynimmy
    • one year ago
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    so that is not the answer?

  11. johnweldon1993
    • one year ago
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    *refers to my post above :)

  12. emmynimmy
    • one year ago
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    would it be 124?

  13. emmynimmy
    • one year ago
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    Awesome thanks!

  14. emmynimmy
    • one year ago
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    The correlation coefficient (r) between the number of miles driven x and the number of gallons of gasoline used y is 0.925. What percent of the variation in the number of gallons of gasoline can be explained by differences in the number of miles driven? 7.5% 14.4% 85.6% 92.5%

  15. Teddyiswatshecallsme
    • one year ago
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    Oh i forgot about the 20.. Yeah, John's right. lolol. Most of these questions are easy you just plug in numbers for x or y and then just add or subtract or whatever.

  16. emmynimmy
    • one year ago
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    okay what about that ^^^

  17. johnweldon1993
    • one year ago
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    Oh didn't see a reply So the correlation coefficient r = 0.925 What we need for variability is R^2 ...so .925^2 = 0.8556 And multiply that by 100 to get the percent which is 85.6%

  18. emmynimmy
    • one year ago
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    Thank you so much!

  19. emmynimmy
    • one year ago
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    @johnweldon1993

  20. johnweldon1993
    • one year ago
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    Oh crap, I hate this one haha I remember the long tedious steps to do this So I'm gonna cheat...1 sec :P

  21. emmynimmy
    • one year ago
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    lol okay thanks!

  22. johnweldon1993
    • one year ago
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    First choice sorry it took so long excel didnt wanna open for me lol :P

  23. emmynimmy
    • one year ago
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    no worries! thankyou!!

  24. johnweldon1993
    • one year ago
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    np :)

  25. emmynimmy
    • one year ago
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  26. emmynimmy
    • one year ago
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  27. emmynimmy
    • one year ago
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  28. emmynimmy
    • one year ago
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  29. emmynimmy
    • one year ago
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    Sorry, I'm literally trying so hard to turn all of my work in on time. Math is my worst subject.

  30. emmynimmy
    • one year ago
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    @johnweldon1993

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