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Math Help - Simple equation using TI-83 calculator

  1. #1
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    Simple equation using TI-83 calculator

    1st let me say hello and this is my 1st post on this site, I've been googling the internet because I am very depeserate. I hope to be a part on your math community here.

    I need to know what keys to hit to solve this simple math problem. I'm using a TI-83 calculator. I'll write the problem out since I don't know how to type in exponents.

    (8 times 10 to the 4th power) x (7.5 times 10 to the negative 6) x (4.4 times 10 to the 15th) / (1.1 times 10 to the 4th) x (2.5 times 10 to the 3rd)4

    The last number 4 is to the 4th power and not 4 times. Again I do not know how to type exponents.

    I know the answer is .00614 but I need to know how to get that answer. If someone is kind enough to tell me which keys to hit to solve the problem. PS I know how to use the shift key so to make things shorter you can just say the name of the key. I also know how to use the negative. I think I'm making a mistake on the bottom of the fraction. Could be something as simple as a parenthases but I've been trying for an hour now...

    Please help
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  2. #2
    Forum Admin topsquark's Avatar
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    Quote Originally Posted by bcarvings View Post
    1st let me say hello and this is my 1st post on this site, I've been googling the internet because I am very depeserate. I hope to be a part on your math community here.

    I need to know what keys to hit to solve this simple math problem. I'm using a TI-83 calculator. I'll write the problem out since I don't know how to type in exponents.

    (8 times 10 to the 4th power) x (7.5 times 10 to the negative 6) x (4.4 times 10 to the 15th) / (1.1 times 10 to the 4th) x (2.5 times 10 to the 3rd)4

    The last number 4 is to the 4th power and not 4 times. Again I do not know how to type exponents.

    I know the answer is .00614 but I need to know how to get that answer. If someone is kind enough to tell me which keys to hit to solve the problem. PS I know how to use the shift key so to make things shorter you can just say the name of the key. I also know how to use the negative. I think I'm making a mistake on the bottom of the fraction. Could be something as simple as a parenthases but I've been trying for an hour now...

    Please help
    "(8 times 10 to the 4th power) x (7.5 times 10 to the negative 6) x (4.4 times 10 to the 15th) / (1.1 times 10 to the 4th) x (2.5 times 10 to the 3rd)4"

    When you are typing out powers of 10, such as in 8 \times 10^4, look for a button that says "EE." It is likely over the "1" key. Write this as "8 EE 4" On your display it will come out as 8 E 4.

    Note that you are dividing by two numbers, so you will want quotes around your divisor.

    For 7.5 \times 10^{-6} you do the same thing, but note that there are two different "-" keys. You are looking for the key where you can type in "-6" without an error, not the key you use for "4 - 3."

    The last 4 is apparently a power. So you want to write this as "^4"

    So
    "(8 times 10 to the 4th power) x (7.5 times 10 to the negative 6) x (4.4 times 10 to the 15th) / (1.1 times 10 to the 4th) x (2.5 times 10 to the 3rd)4"

    becomes
    8 EE 4 x 7.5 EE -6 x 4.4 EE 15 / ( 1.1 EE 4 x 2.5 EE 3 ^ 4 )

    I get 0.006144 out of this.

    -Dan
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  3. #3
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    om gosh I've been working on that problem for a friggen hour. Now I get that concept and that will be with me forever! Thanks! I had no problem doing the rest of my homework! Except for.... Todays.....

    Now How do you punch in this one?
    4(the square root of the rest of the problem) (6.63 times 10^-34) x (6.02 times 10^23) / (9.1 times 10^31)
    The answer is 1.44 x 10^5
    I just don't know how to get that answer.... You have no idea how much stress and time you are saving me. Thanks so much!
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  4. #4
    Forum Admin topsquark's Avatar
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    Quote Originally Posted by bcarvings View Post
    om gosh I've been working on that problem for a friggen hour. Now I get that concept and that will be with me forever! Thanks! I had no problem doing the rest of my homework! Except for.... Todays.....

    Now How do you punch in this one?
    4(the square root of the rest of the problem) (6.63 times 10^-34) x (6.02 times 10^23) / (9.1 times 10^31)
    The answer is 1.44 x 10^5
    I just don't know how to get that answer.... You have no idea how much stress and time you are saving me. Thanks so much!
    That 4 in front caused me some grief. You need to tell me what these things are!

    The symbol \sqrt[4]{x} can be expressed as an exponent: [tex]\sqrt[4]{x} = x^{1/4}

    I also noticed that the last number should be 9.11 \times 10^{-31} (you left the negative sign off the exponent when you typed it in.)

    So put in
    ( 6.63 EE -34 * 6.02 EE 23 / 9.1 EE -31 ) ^ (1 / 4 )

    (When you hit the square root key your calculator might automatically put a ( on it. Mine does, anyway, but it's a TI-92, not an 83.)

    -Dan
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