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3 years ago

What is the radius of the circle who’s equation is x^2 + y^2 = 9

Mathematics

1 answer:

Svetllana [295]3 years ago

8 0

Answer:

r=3

Step-by-step explanation:

The equation of a circumference is $(x-a)^2+(y-b)^2=r^2$ .
Then , in this case $r^2=9$ , and then to know the value of r we just simply have to calculate the square root of 9, which is 3.

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J is the midpoint of KL. The coordinates of J are (-8,7) and the coordinates of K are (3,4) find the coordinates of L. (show wor

musickatia [10]

Assuming linear.
if k is at (3,4) and j is at (-8,7)
set. (y1,x1) and(y2,x2)

[(y2-y1),(x2-x1)]
[(-8-3),(7-4)]
distance from k to j is (-11,3)

now take coordinates of j and distance from. k->j and add them to get coordinate for L

[(-11+(-8)),(7+3)]= (-19,10)=L

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3 years ago

Doug dives from a platform that is 7.5 meters above water. His dive takes him 2.1 meters below the surface of the water. How far

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Not so sure.. but I got 9.6 meters below water level.

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2 years ago

Hildy had 2.5 oz of liquid for a science experiment. the instructions said that the experiment needed 3 oz of liquid. she went t

solmaris [256]

For this case we have the following amount of liquid:
2.5 oz.
The amount of liquid needed is:
3 oz.
Therefore, the amount of fluid needed is:
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Answer:
b. no, hildy did not get a reasonable amount of liquid because she only needed 0.5 oz (3 - 2.5 = 0.5).

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2 years ago

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You have a 1-gallon paint can in the shape of a cylinder. One gallon is 231 cubic inches. The radius of the can is 3 inches. Wha

aleksandr82 [10.1K]

Answer:

The approximate height of the paint can is 8.2 in

Step-by-step explanation:

we know that

The volume of the cylinder ( can of paint) is equal to

$V=\pi r^{2} h$

we have

$V=231\ in^{3}$

$r=3\ in$

$\pi=3.14$

Substitute the values and solve for h

231=(3.14)(3)^{2} h

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2 years ago

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Please Help! 25 Points!

Leno4ka [110]

Since you're going towards the left you can say that your answer is getting "more" negative for the first coordinate. As such you want your answer to be less negative than -21, also the second coordinate seems to be getting "less negative" as such anything less than -9 should not be an option. Lastly the difference between the two points for the first coordinates is 5, more specifically you are subtracting 5 to the first coordinate and for the second coordinate you are adding 3. Following this patter we say that the answer is
$- 21 - 5 = - 26 \\ - 9 + 4 = - 5$
and so, the answer is B (-26,-5)

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2 years ago

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