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Ghella [55]
3 years ago
15

How to write an equation in standard form for a circle of other radius 3 centered at the origin

Mathematics
2 answers:
natali 33 [55]3 years ago
5 0

Answer:

from \: general \: equation \\  {x}^{2}  +  {y}^{2}  + 2gx + 2fy + c = 0 \\ at \: the \: origin \:  \: g = 0 \: and \: f = 0 \\since \: c =  {g}^{2}  +  {f}^{2} +  {r}^{2}  \\ whe re \: r \: is \: radius \\  therefore \: c =  {3}^{2}  = 9 \\  =  >  {x}^{2}  +  {y}^{2}  + 9 = 0

Y_Kistochka [10]3 years ago
3 0

Answer:

What is the diameter of a circle if the radius is 3

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Find the coordinates of P so that P partitions in the ratio 1 to 3 with A(-5, 4) and B(7, -4).
nataly862011 [7]

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(2.5 , 0)

Step-by-step explanation:

Hope this helps!

7 0
3 years ago
an anoymous survey of college students was taken to determine behaviors regarding alcohol,cigarretes and illegal drugs 859 drank
Sveta_85 [38]
You have to use carefully Venn Diagram to solve this problem:
n, here below means number of students

GIVEN
----------
n(Cigarettes) = 645
n(Alcohol) = 859
n(Drugs) = 207
n(Alcohol ∩ Cigarettes) = 397
n(Alcohol ∩ Drugs) = 109
n(Alcohol ∩ Cigarettes ∩ Drugs) = 85
And 274 Students "Clean from any of the above"
Let x be the unknown number, that is n(Cigarettes ∩ Drugs)
Start by drawing 3 intersecting circles, one for Alcohol, another for Cigarettes and the 3rd for Drugs:

1) n( Alcohol ONLY) =859-397-109-85 = 268 (only Alcohol)

2) n( Cigarettes ONLY) =645-397-85 - x= 163 - x  (only Cigarettes)

3) n( Drugs ONLY) =207- 109 -85 - x = 13 - x (only Drugs).

(Remember that there are 274 Students clean, not shown in Venn)

Total of students (we need it to solve):

TOTAL n(STUDENT) = Alcohol Alone+ Cigarette Alone+ Drug Alone + 274
TOTAL n(STUDENT) = 268 + (163-x) + (13-x) + 274
TOTAL n(STUDENT) = 718 -2x
(hope you can get the TOTAL n(STUDENT) to be able to find x, which is the  
n(Drugs ∩ Cigarettes)

3 0
3 years ago
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