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

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

Thank u strawberry !

in other words

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

(Just taken)

oh YUH we all cheating 2020

2021 ANSWERS

1) A.
domain -4<_x<_4
range -4<_x<_4

2)B
it has two lines of symmetry, the x-axis and the y-axis

3)A
domain all real numbers
range {y|y<_-sqrt7 or y>_sqrt7}

4) C)
the center of the circle is (0,0)
x intercepts are (6,0) and (-6,0)
y intercepts (0,6) and (0,-6)

5) C
y=1/20 x^2

6) B
focus (6,0) directrix x=-6

7)A
y=-2/81x^2+50

8) D
vertex (4,-5) focus (4,2) directrix y=-12

9) A
(x+7)^2+(y+6)^2=4

10)B
(x+3)^2+(y-4)^2=49

11) C
(x-3)^2+(y-5)^2=64

12) D
center (1,-1) radius 2

13) B

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

A

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

Still correct for Unit 7 Lesson 3 !

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

Yo thanks for all the answers man

^ for U5 L3 connexus (circles)

Thanks guys to everyone who posts answers online for school