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Thread: Need help with a few easy calculus problems

  1. #1
    Apr 2010

    Need help with a few easy calculus problems

    I have to submit this HW in under 30 minutes. I appreciate any help anyone can give me. Thank you so much!

    1) John (whose line of sight is 6 ft above horizontal) is trying to estimate the height of a tall oak tree. He first measures the angle of elevation from where he is standing at 35 degrees. He walks 30 ft closer to the tree and finds that the angle of elevation has increased by 12 degrees. Estimate the height of the tree rounded to nearest whole number

    A) 90ft B) 67ft C) 61 ft D)86 ft


    3) Match the point in polar coordinates with either A(Quadrant 1) B (Quadrant 2) C( Quadrant 3) D(Quadrant 4)


    4) Two sides and angle are given. Determine wheter the info is one triangle, 2 triangles or no triangle.

    a=7, b=9, B=49 degrees

    A) Two triangles
    B) one triangle (A=76.01, C=54.99, c=7.60)
    C) One triangle (A=35.94, C=95.06, c=11.88)
    D) no triangle


    Pretty sure its A, but I want to double check

    6) Does the complex fourth roots of -16 start with

    A) 2(cos 90 + i sin 90)
    B) 2 (cos 45+i sin 45)
    C) 16(cos 45+i sin 45)
    D) 4th root of 2(cos 45+i sin 45)

    Pretty sure its B, but I want to double check

    7) r=6+2 sin theta; the line theta = pi/2

    A) Symetric with respect to line
    B) may or may not be symmetric with respect to line

    Pretty sures its B, just want to make sure
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  2. #2
    Flow Master
    mr fantastic's Avatar
    Dec 2007
    0. MHF does not knowingly help with questions that count towards a student's final grade, which these most likely do. Such work is meant to be the work of the student, not the work of other people.

    1. These questions are not calculus questions and should not be titled as such. Calculus questions involve differentiation, integration etc. The source of the question is irrelevant, the content iof the question is what determines the forum most appropriate for it. These questions are PRE-calculus in content.

    2. Please don't post more than two questions in a thread. Otherwise the thread can get convoluted and difficult to follow. It is better for forum organization and better for you to get your questions answered in a more timely manner if you start new threads as necessary for remaining questions. eg. If you have five questions, post two of them in two threads and start a new thread for the remaining one etc.

    And if the question has more than two parts to it, it is best to post only that question and its parts in the thread and start a new thread for other questions.

    3. And when you do the above, please give a new name to a new thread. Don't use the same name as an old one.

    Thread closed.
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