Pre-Calc

Please check my answers I really need to do my homeowrk!;This are polar coordinates we're studying-I'm almost positive the first two are correct.
1.Which of the folowing is another representation of (-3,pi)?
(3,120degree)
(3,0 degree)I think it is this one??
((-3,0 degree)
2.Which is not a representation of (5,150 degree)
(-5,-30 degree)I think it is this one?
(-5,330 degree)
(5,510 degree)

3.Give 3 representations of (3,240 degree)One has to be in radians
My choices are: (3,600 degrees)
(3,-120 degree degree)
(-3,pi/3)
4.Give 3 representations of (-6,3pi/4)one has to be radians
I gave-(-6,495 degrees)
(-6,-225 degrees)
(6,-pi/4)

  1. 👍
  2. 👎
  3. 👁
  1. 1. (-3,pi) = -3cos(pi) + i(-3)sin(pi) =
    3 + io = 3.

    (3,120deg) = -1.5 + i2.6
    (3,0deg) = 3 + i0 = 3.
    (-3,0deg) = -3 + i0 = -3.

    2. (5,150deg) = -4.33 + i2.5

    (-5,-30deg) = -4.33 + i2.5
    (-5,330deg) = -4.33 + i2.5
    (5,510deg) = -4.33 + i2.5
    My calculations show that all of # 2 is
    identical.

    3. (3,240deg) = -1.5 - i2.6

    (3,600deg) = -1.5 - i2.6
    (3,-120deg) = -1.5 - i2.6
    (-3,pi/3) = -1.5 - i2.6
    Good!!

    4. (-6,3pi/4) = 4.24 - i4.24

    (-6,495deg) = 4.24 - i4.24
    (-6,-225deg) = 4.24 -i4.24
    (6,-pi/4) = 4.24 - i4.24.

    Very good!

    1. 👍
    2. 👎

Respond to this Question

First Name

Your Response

Similar Questions

  1. Math

    The letters r and θ represent polar coordinates. Write the following equation using rectangular coordinates (x, y). Given equation r=5

  2. pre-calc help

    Convert the rectangular coordinates to polar coordinates with r > 0 and 0 ≤ θ < 2π. (9, −9) (r, θ) = ?

  3. Trig

    Which of the following polar coordinates describes the same point as the point (5, -pi/6) given in polar coordinates? a.) (5, pi/6) b.) (-5, -pi/6) c.) (5, 5pi/6) d.) (-5, 5pi/6) e.) none of these

  4. Chemistry (please check)

    1)Which of the following compounds has the largest lattice energy: LiF LiCl NaF NaCl 2)Which of the following compounds has the most ionic character in its bonding: CaBr2 GeBr4 KBr GaBr3 3)Using the electronegativity table on page

  1. trig

    The rectangular coordinates of a point are given (0,-6). Find polar coordinates of the point such that r greater than 0 and 0 less than or equals theta less than 2pi. how to solve this damon please help me

  2. Precalculus

    Every point in the plane has exactly two polar coordinates. A)The statement is true because every point in the plane has a unique polar representation. B)The statement is false because left parenthesis r comma theta right

  3. chemistry

    What two conditions necessary for molecules to be polar? Her's my answer pls check. First, at least one covalent bond in the molecule has to be a polar covalent bond. For a bond to be polar, there must be a difference in the

  4. Math

    plot the point given in polar coordinates and find the corresponding rectangular coordinates for the point. (-1 , -3pi/4) I do not understand.

  1. trig

    The rectangular coordinates of a point are given (-5,-5root3). Find polar coordinates of the point. Express theta in radians.

  2. pre-calc help

    Convert the rectangular coordinates to polar coordinates with r > 0 and 0 ≤ θ < 2π. (9, −9) (r, θ) = ?

  3. Math

    Let the polar coordinates of the point (x, y) be (r, θ). Determine the polar coordinates for the point (2x, y)

  4. Trig (math)

    1.) Find all solutions of the equation. Leave answers in trigonometric form. x^2 + 1 - sqrt3i = 0 2.) Give the rectangular coordinates for the point. (9, 2pi/3) 3.) The rectangular coordinates of a point are given. Express the

You can view more similar questions or ask a new question.