15. A boat travels 30 miles upstream in 4 hours. The trip downstream takes 2.5 hours. Find the rate of the boat in still water.

33. Solve the following: (q + 2)^2 = 25

34. Solve the following: y^2 + 6y + 9 =49

39. How many real roots are there for the equation x^2 + 3x -1?


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  1. 15.
    You have posted this same question before and it was answered for you.
    You should make a log of all the questions and their times you post, and check before posting it again.

    33. very simple, take √ of both sides to get
    q+2 = ± 5
    q = 2 ± 5 or 7 and -3

    34. the left side is a perfect square so your equation becomes
    (x+3)^2 = 49 and now follow the steps of #33

    39. You don't have an equation, it should be
    x^2 + 3x - 1 = 0 perhaps ?
    If so, evaluate b^2-4ac
    = 9-4(1)-1) = 13
    so you would have two real roots

    Please acknowledge so we know that you actually read these replies.

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  2. Thank you for your help!

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  3. welcome

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