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Nezavi [6.7K]
3 years ago
12

If anyone really knows the answer please help

Mathematics
1 answer:
Kamila [148]3 years ago
4 0

First you need to find the area of the plate.

The formula for the area of a circle is Area = pi *r^2

The radius (r) is given as 6 inches.

We will  use 3.14 for pi

Area = 3.14 x 6^2

Area = 3.14 x 36

Area = 113.04 square inches.


Now to find the density, divide the total bacteria by the area:


Density = 120,000 / 113.04 = 1061.57 which rounds up to 1,062 bacteria/ square inch.

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4. Stella says the equation x^2−8x+y^2+2y=5 has a center of (4,−1) and a radius of 5. Is she correct? Why or why not?
Ostrovityanka [42]
<h2>Stella is correct about center and wrong about radius      </h2>

Step-by-step explanation:

Equation of circle with (h,k) as center and radius r is given by,

          (x-h)²+(y-k)² = r²

Here equation is

          x²−8x+y²+2y=5

Changing in to (x-h)²+(y-k)² = r² form

           x²−8x + 16 - 16 +y²+2y+1 - 1=5  

           (x-4)² - 16 + (y+1)² -1 = 5

           (x-4)²  + (y+1)²  = 22

           (x-4)²  + (y+1)²  = 4.69²

           Center is (4,-1) and radius is 4.69

Stella is correct about center and wrong about radius            

8 0
2 years ago
What is 1,248 divide by 16?
inn [45]
I think the answer is 78. 
7 0
3 years ago
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Cloud [144]

Answer:

2.056

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Plz mark brainliest!! :DD

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2 years ago
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What’s the correct answer for this
Olenka [21]
Given 2 angle : 45 and 90 (right angle)
==> 180-45-90 = 45
5 0
3 years ago
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What digit 5 sits in this number 725,069​
Leokris [45]

Answer:

The digit 5 is equal to is 5,000 :)

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