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toxicsugar22

  • 5 years ago

Suppose x and y are two possitive numbers. Write an expression for their average, and then for the reciprocal of their average

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  1. anonymous
    • 5 years ago
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    what is the average of n numbers?

  2. toxicsugar22
    • 5 years ago
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    i dk am i dupposed to know or is it in the question

  3. anonymous
    • 5 years ago
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    you are supposed to know.

  4. anonymous
    • 5 years ago
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    suppose I had profits of 1000 dollars in one month and a profit of 500 dollars is the next month, what is my average profit for the two months?

  5. anonymous
    • 5 years ago
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    in other words, what is my average profit per month?

  6. toxicsugar22
    • 5 years ago
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    750

  7. anonymous
    • 5 years ago
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    okay, good. how did you figure that out?

  8. anonymous
    • 5 years ago
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    doing good sugar haha (:

  9. toxicsugar22
    • 5 years ago
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    i added 1000 and 500 and divided by 2 to get the average

  10. anonymous
    • 5 years ago
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    good. so what if I told you that my profit for first month was 1000, second month was 500 and third month was 600. what is my average profit?

  11. toxicsugar22
    • 5 years ago
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    700

  12. anonymous
    • 5 years ago
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    very good. what did you do to get that answer?

  13. toxicsugar22
    • 5 years ago
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    i added all three and divided it by three

  14. anonymous
    • 5 years ago
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    good. so what if I told you my profit for the first month was x and my profit for second month was y, what is my average profit?

  15. toxicsugar22
    • 5 years ago
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    would it be x+y divided by 2

  16. anonymous
    • 5 years ago
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    exactly! very good!

  17. anonymous
    • 5 years ago
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    so your expression is average = (x+y)/2

  18. anonymous
    • 5 years ago
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    if you had 10 numbers, then your average would be (a+b+c+d+e+f+g+h+i+j)/10

  19. anonymous
    • 5 years ago
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    where a,b,c... are the 10 numbers

  20. toxicsugar22
    • 5 years ago
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    ok and can u tell me how do i write the recipocal of the average

  21. anonymous
    • 5 years ago
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    reciprocal of a number x is 1/x. the reciprocal is a number, which when multiplied by x, gives you 1. 1 is called the multiplicative identity. so, when you multiply x times 1/x, you get x/x = 1 similarly, what is the reciprocal of the number (x+y)/2 ?

  22. toxicsugar22
    • 5 years ago
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    ok i got it its 2/(x+y)

  23. anonymous
    • 5 years ago
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    okay very good!

  24. toxicsugar22
    • 5 years ago
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    and one more quesion, for the same numbers x and y, write an expresiion for their average of their recipocals how do i do that

  25. anonymous
    • 5 years ago
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    what is the reciprocal of x? what is the reciprocal of y?

  26. toxicsugar22
    • 5 years ago
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    x/1 and y/1 is that right

  27. anonymous
    • 5 years ago
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    so if you multiply x times x/1 you will get 1? are you sure?

  28. toxicsugar22
    • 5 years ago
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    im srry 1/x and 1/y

  29. anonymous
    • 5 years ago
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    okay good. so now you have two numbers 1/x and 1/y. what is their average?

  30. toxicsugar22
    • 5 years ago
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    2/xy

  31. anonymous
    • 5 years ago
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    no. thats wrong. the average of two numbers a and b is (a+b)/2 so what is the average of two numbers 1/x and 1/y?

  32. toxicsugar22
    • 5 years ago
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    (1/x+1/y)/2

  33. anonymous
    • 5 years ago
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    okay. good. that is your answer. you can simplify the expression further if you want, but that is the answer to your question. 1/x+1/y = (x+y)/xy so (1/x+1/y)/2 = (x+y)/2xy

  34. toxicsugar22
    • 5 years ago
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    ok thank you

  35. anonymous
    • 5 years ago
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    or rather, 2(x+y)/xy

  36. anonymous
    • 5 years ago
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    no, its the first one. sorry.

  37. toxicsugar22
    • 5 years ago
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    ok thanks

  38. anonymous
    • 5 years ago
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    (:

  39. toxicsugar22
    • 5 years ago
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    hey can u help me with another question math mind can u try

  40. toxicsugar22
    • 5 years ago
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    Andy drives 300 miles to Lake Tahoe at 70 miles per hour and returns home at 50 mph. What is his average speed for the round trip. (It is not 6o miles per hour.) Write expressions for the time it takes for each leg of the trip if Andy drives a distance d, at speed r base 1 and returns at speed r base 2

  41. anonymous
    • 5 years ago
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    post it up as a new question, it's better

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