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is3535

  • one year ago

help

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  1. is3535
    • one year ago
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    2.9x10^10 + 5.35x10^10

  2. is3535
    • one year ago
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    @freckles

  3. is3535
    • one year ago
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    @phi

  4. phi
    • one year ago
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    your problem is like a*x + b*x factor out the x (a+b) * x in your case the "decimals" are like a and b, and x is like 10^10

  5. is3535
    • one year ago
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    |dw:1442260989838:dw|

  6. phi
    • one year ago
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    yes, I know. Do you know how to "factor out" 10^10 ?

  7. is3535
    • one year ago
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    no

  8. phi
    • one year ago
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    ok do you know how to distribute the 10 in this: 10* ( 2 + 3) ?

  9. phi
    • one year ago
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    10*(2+3) can be written as 10*2 + 10*3 factoring out 10 "undoes" that we want to do that with your problem \[ 2.9\cdot10^{10} + 5.35\cdot10^{10}= (2.9+5.35) \cdot 10^{10} \]

  10. phi
    • one year ago
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    now use order of operations: do the operation inside the parens (i.e. add)

  11. is3535
    • one year ago
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    ok

  12. is3535
    • one year ago
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    my answer is 82.5x10^11

  13. phi
    • one year ago
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    what do you get when you add 2.9 and 5.35

  14. is3535
    • one year ago
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    8.25

  15. phi
    • one year ago
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    8.25 so 8.25 * 10^10 if you want this in scientific notation, then you want the number "out front" to be 1 or bigger , but less than 10 8.25 is bigger than 1 and smaller than 10 so it's ok \[ 8.25 \cdot 10^{10} \]

  16. is3535
    • one year ago
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    do you want me to time it

  17. phi
    • one year ago
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    ?

  18. is3535
    • one year ago
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    82.5x10^11

  19. phi
    • one year ago
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    you mean write it as 8.5x10^10 (with an "x" ?) I used a dot (or *) because in algebra we use x for variables. but anyway you write it , it means the same thing. 8.25 times 10^10 the answer is not 82.5 x 10^11 the answer is 8.25 x 10^10 which can be written as 82.5 x 10^9 (but this is *not* scientific notation because 82.5 is too big)

  20. is3535
    • one year ago
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    that my answer is 8.25 x 10^10

  21. phi
    • one year ago
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    yes

  22. is3535
    • one year ago
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    ok

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