3 years ago

What is the diameter in inches of a circle that has an area of 81

Mathematics

1 answer:

devlian [24]3 years ago

7 0

Answer:

d = 10

Step-by-step explanation:

A = πr²

81 /π = r²

r² ≈ 25

r = 5

d = 5(2) or 10

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BabaBlast [244]

Answer:

Step-by-step explanation:

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3 years ago

9n - 16 -1 + 3n Pls help

Jlenok [28]

Answer:

17/12

Step-by-step explanation:

12n-17=0

12n=17

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3 years ago

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Answer:

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3 years ago

What is the equation of the parabola, in vertex form, with focus at (1,-4) and<br> directrix x= 3?

lilavasa [31]

Answer:

Step-by-step explanation:

1) according to the definition of parabola d(focus)=f(directrix),

2) then

$d(focus)=\sqrt{(x-1)^2+(y+4)^2} \ and \ d(directrix)=|x-3|;$

$\sqrt{(x-1)^2+(y+4)^2} =|x-3|;$

3) after evoluation the equation:

(y+4)²=-4x+8 or (y+4)²= -4(x-2);

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3 years ago

-16 - 6v = -2 (8v -7)

sashaice [31]

-16-6v = -16v+14

-6v= -16v+30

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v=3

5 0

4 years ago