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Math Help - some math questions

  1. #1
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    some math questions

    I'm not too good at math at all I need help with these three problems any feedback or help will be greatly appreciated

    1)108 divided by (6/7) 2nd power + 180 divided by (3/5) 2nd power


    2) Find the base of a triangle with area 114 square inches and height 12 inches

    3) 15q/16 x 8/30q multiply simplify if possible

    These are the last three problems on my assignment...any help is greatly appreciated thank you
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  2. #2
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    Quote Originally Posted by Retiredyoung24@yahoo.com View Post
    I'm not too good at math at all I need help with these three problems any feedback or help will be greatly appreciated

    1)108 divided by (6/7) 2nd power + 180 divided by (3/5) 2nd power
    1.) 108/[(6/7)^2] + 180/[(3/5)^2], is that what you're referring to?

    (6/7)^2 = 36/49;
    108/(36/49) = 147 (bring the 49 to the numberor and multiply it to get 5292, then divide by 49)

    +

    (3/5)^2 = 9/25;
    180/(9/25) = 500

    So: 147 + 500 = 647.
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  3. #3
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    Quote Originally Posted by Retiredyoung24@yahoo.com View Post
    2) Find the base of a triangle with area 114 square inches and height 12 inches
    Area of a triangle = (1/2)*b*h.

    You're given that the area = 114, and you're given the height. Solve for the base.

    114 = (1/2)*b*12

    114 = 6*b

    Divide both sides by 6:

    19 = b

    Therefore, the base is 19 inches.
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  4. #4
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    Thanks man this remedial math is killing me
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  5. #5
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    Quote Originally Posted by Retiredyoung24@yahoo.com View Post
    3) 15q/16 x 8/30q multiply simplify if possible
    Be careful with parentheses; I am assuming you mean the following:

    (15q)/16 * 8/(30q)

    The 15q and the 30q cancel, and you obtain:

    (15q is one half of 30q).

    1/16*8/2 = 1/4.

    (You could have even simplified it further by reducing the 8 and the 16 to a 1/2 ratio, which would have made the multiplication slightly easier: so you would have had 1/2*1/2 = 1/4).
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  6. #6
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    Quote Originally Posted by Retiredyoung24@yahoo.com View Post
    I'm not too good at math at all I need help with these three problems any feedback or help will be greatly appreciated

    1)108 divided by (6/7) 2nd power + 180 divided by (3/5) 2nd power
    I will assume that 1 and 3 mean what is shown in the attachment.

    1. Take the first term:

    .......................108.........108x7^2......108
    108/(6/7)^2 = -------- = ---------- = ----- x 7^2 = 3x7^2 = 3x7x7 = 147
    .....................(6/7)^2........6^2.........6x6

    Now take the second term:

    .......................180.........180x5^2......180
    180/(3/5)^2 = -------- = ---------- = ------ x 5^2 = 20x5^2 = 20x5x5 = 500
    .....................(3/5)^2.........3^2........3x3

    So:

    108/(6/7)^2 + 180/(3/5)^2 = 147 + 500 = 647

    RonL
    Attached Thumbnails Attached Thumbnails some math questions-gash.jpg  
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