Math :(

posted by I Dont Matter

Please help me with this. Can you explain to me how to find the answer?

Multiply 3.8*10^8 by 7.2*10^-3, leave your answer in a scientific notation.

2.736*10^4
2.736*10^5
2.736*10^6
27.36*10^5

Honestly, I don't the answer to the question So please forgive the wrong answer if I pick the wrong answer.

  1. Damon

    well, try 4 *10^8 * 7*10^-3

    = 28 * 10^(8-3)

    = 28 * 10^5
    BUT we are only allowed one digit left of decimal point
    = 2.8 * 10^1 * 10^5
    =2.8 * 10^6
    which is pretty much like 2.736*10^6

  2. Steve

    you need a number at least 1, and less than 10
    and a power of 10.

    For this problem, multiply the numbers and add the powers of 10.
    Then simplify to scientific notation.

    3.8*10^8 by 7.2*10^-3
    = (3.8 * 7.2) * 10^(8-3)
    = 27.36 * 10^5
    but, 27 > 10, so
    = (2.736 * 10^1) * 10^5
    = 2.736 * 10^6

  3. Me

    Thank you Damon for helping him. I was trying to figure this question out but i got stumped. What is ^ as a math symbol and what does it represent ?

  4. Damon

    ^ means superscript
    2^3 means 2 to the third power = 2*2*2 = 8

  5. Damon

    By the way that ^ is not really a math symbol but a keyboard convention.

  6. I Dont Matter

    IDK why this comment got deleted. I don't like being referred to as him. I'm a girl who put I Don't Matter as her username. There's nothing wrong with correcting people about what gender I am. I can understand that he probably was assuming, but I have every right to correct him. So don't delete this comment

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