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anonymous

  • one year ago

plz i need help :( Evaluate the expression if a = 1 and b = 2. fraction numerator 5 left parenthesis a star times plus 3 b right parenthesis over denominator a b end fraction A. 20 B. 5.5 C. 15 D. 17.5

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  1. freckles
    • one year ago
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    \[\frac{5( \star \cdot 3b)}{ab}\] any idea what the value we should plug in for the star ?

  2. anonymous
    • one year ago
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    1

  3. freckles
    • one year ago
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    so you are given \[a=1, b=2, \star=1\]

  4. freckles
    • one year ago
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    replace a with 1 replace b with 2 replace star with 1 then \[\frac{5( \star \cdot 3b)}{ab}=\frac{5(1 \cdot 3(2))}{1(2)}\]

  5. anonymous
    • one year ago
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    no the star is a

  6. freckles
    • one year ago
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    oh your problem said something about a star in it

  7. anonymous
    • one year ago
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    and a is 1

  8. anonymous
    • one year ago
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    sorry about that

  9. freckles
    • one year ago
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    I'm sorry kind of confused about times plus and what that means exactly

  10. freckles
    • one year ago
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    can you draw the problem or is it really worded like that?

  11. anonymous
    • one year ago
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    ok

  12. anonymous
    • one year ago
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    |dw:1441573677006:dw|

  13. freckles
    • one year ago
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    \[\frac{5(a+3b)}{ab} \\ \\ \text{ okay so replace } a \text{ with 1} \text{ and } b \text{ with 2} \\ \frac{5(1+3 \cdot 2)}{1(2)}\]

  14. freckles
    • one year ago
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    do you know how to do 5(1+3*2) and 1(2)?

  15. anonymous
    • one year ago
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    no

  16. freckles
    • one year ago
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    1(2)? come on you know this 2

  17. freckles
    • one year ago
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    1 times a is a

  18. freckles
    • one year ago
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    1 times 2 is 2

  19. anonymous
    • one year ago
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    ok

  20. freckles
    • one year ago
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    5(1+3*2) here we apply order of operations what is 3*2?

  21. anonymous
    • one year ago
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    6

  22. freckles
    • one year ago
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    ok so we have now 5(1+6)

  23. freckles
    • one year ago
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    1+6=?

  24. anonymous
    • one year ago
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    7

  25. freckles
    • one year ago
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    and then whatever you get for 1+6 multiply that result by 5 so you should end up with 5 times 7

  26. freckles
    • one year ago
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    which is..

  27. anonymous
    • one year ago
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    35

  28. freckles
    • one year ago
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    \[\frac{5(a+3b)}{ab} \\ \\ \text{ okay so replace } a \text{ with 1} \text{ and } b \text{ with 2} \\ \frac{5(1+3 \cdot 2)}{1(2)} \\ =\frac{5(1+6)}{2}=\frac{5(7)}{2}=\frac{35}{2}\]

  29. freckles
    • one year ago
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    and you are basically done just need to write as a decimal

  30. freckles
    • one year ago
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    since your choices are written that way

  31. anonymous
    • one year ago
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    but there's no 35/2

  32. freckles
    • one year ago
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    yes that is why I said to write as a decimal

  33. anonymous
    • one year ago
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    35.2

  34. freckles
    • one year ago
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    how did you get 35.2?

  35. freckles
    • one year ago
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    |dw:1441574329519:dw| 2 doesn't go into 3, 3 times... 2 goes into 3, 1 times

  36. freckles
    • one year ago
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    |dw:1441574353259:dw|

  37. freckles
    • one year ago
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    2 goes into 15 how many times?

  38. anonymous
    • one year ago
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    oh

  39. anonymous
    • one year ago
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    7

  40. freckles
    • one year ago
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    |dw:1441574417155:dw| and finally 2 goes into 10 how many times?

  41. anonymous
    • one year ago
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    5

  42. freckles
    • one year ago
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    right |dw:1441574443279:dw| \[\frac{35}{2}=17.5\]

  43. anonymous
    • one year ago
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    thx

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