algebra

Can someone check my answers please and if Im wrong please explain.

1) graph 4x^2+4y^2=64. what are the domain and range?

domain;all real numbers
range;-4<=4<=4

2) graph 4x^2+y^2=9. what are its lines of symmetry?

it has two lines of symmetry, the x axis and the y axis

3) graph -3x^2+12y^2=84. what are the domain and range?

domain; all real numbers
range; {y[y<=-sqrt7 or y>= sqrt7}

4) identify the center and intercepts of the conic section. then find the domain and range.

the center of the circle is (0,0)
the x intercepts are (6,0) and (-6,0)
the y intercepts are (0,6) and (0,-6)
the domain is {x[-6<=x<=6}
the range is {y[-6<=y<=6}

5) write an equation of a parabola with a vertex at the origin and a directrix at y=5.

y=-1/20x^2

6) what are the focus and the directrix of the graph of x=1/24y^2?

focus(6,0)
directrix x=-6

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  1. years late to the party but all of them are right except for the first!! for anyone else taking the unit 5 lesson 3 circles quiz, here are the rest of the answers too

    1. graph 4x^2+4y^2=64. what are the domain and range?
    A. domain: -4 <= x <= 4, range: -4 <= y <= 4

    7. in a factory, a parabolic mirror to be used in a searchlight was placed on the floor....
    A. y = -2/81x^2 + 50

    8. what are the vertex, focus, and directrix of the parabola within the given equation?
    D. vertex: (4,-5); focus: (4,2); directrix: y= -12

    9. write an equation of a circle with the given circle and radius, center (-7,-6) and radius 2
    A. (x+7)^2 + (y+6)^2 = 4

    10. write an equation for the translation of x^2 +y^2 = 49 by 3 units left and 4 units up
    B. (x+3)^2 + (y-4)^2 = 49

    11. write an equation in standard form for the circle
    C. (x-3)^2 + (y-5)^2 = 64

    12. what is in the center and radius of the circle with the given equation? (x-1)^2 + (y-1)^2 = 4
    D. center (1,-1); radius 2

    13. what is the graph of the equation? (x+8)^2 + (y-1)^2 = 9
    B. the circle is on the left side of the graph, near the -8 on the horizontal line. look closely, one is placed slightly higher on the graph than the other.

    hope someone out there is saved an extra 10 minutes or so by this

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  2. Yo thanks for all the answers man

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  3. Thank u strawberry !
    in other words

    A
    B
    A
    C
    C
    B
    A
    D
    A
    B
    C
    D
    B

    (Just taken)

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  4. ^ for U5 L3 connexus (circles)

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  5. thanks strawberry but mine had said unit 7 lesson 3

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  6. A
    B
    A
    C
    C
    B
    A
    D
    A
    B
    C
    D
    B

    Still correct for Unit 7 Lesson 3 !

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  7. oh YUH we all cheating 2020

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  8. 100%! thanks strawberry

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  9. 1 A
    2 B
    3 A
    4 C
    5 C
    6 B
    7 A
    8 D
    9 A
    10 B
    11 C
    12 D
    13 B

    100 % lesson 3 quiz connexus

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  10. thank you so much omg I’ve never found an algebra answer this easy before you are loved by all online school kids 🥺

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  11. Thanks guys to everyone who posts answers online for school

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  12. yall the awesome, thank you all

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  13. thanks.. been stressed about keeping a grade above D lol, just tryna pass.

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  14. anyone got the answers for part 2 of the quiz? im dyin here

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  15. yoo thank you strawberry! Ur a lifesaver bruh

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