1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
Zina [86]
3 years ago
5

There are 2,100 bacteria in a circular petri dish. The dish has a radius of 40 millimeters. What is the approximate population d

ensity? (Use 3.14 for π)
Mathematics
2 answers:
pochemuha3 years ago
6 0
A petri dish is simply a circle; thus, we use the formula of the area of the circle which is <span>πr^2. 
Given r = 40 mm
A = </span>π(40)^2 = <span>5026.55 sq. mm
</span>
Population density = bacteria count / area
PD = 2,100 / <span>5026.55
PD = </span><span>0.417782 bacteria / mm sq.

Therefore, the answer is approximately 0.418 </span><span>bacteria per square millimeter.</span>
saul85 [17]3 years ago
3 0
Determine the area of the circular petri dish through the equation, A = <span>πr^2. Substituting the radius to the equation and solving for area gives, 5024 mm^2. The population density is obtained by dividing the population with the calculated area. Thus, the population density is approximately 0.418 bacteria per mm^2. </span>
You might be interested in
Geometry: The rectangle shown has a perimeter of 34cm and the given area. Its length is 5 more than twice it's width. Write and
Thepotemich [5.8K]

w - width

2w + 5 - length

w + w + (2w + 5) + (2w + 5) = 6w + 10 - perimeter

34 cm - perimeter

The equation:

6w + 10 = 34    <em>subtract 10 from both sides</em>

6w = 24    <em>divide both sides by 6</em>

w = 4 cm

2w + 5 = 2(4) + 5 = 8 + 5 = 13 cm

<h3>Answer: Width = 4cm, Length = 13cm</h3>
3 0
3 years ago
Given the Functions.
andrew-mc [135]

Answer:

  • a.  g(-1)=-16
  • b.  g(2)=2
  • e.  f(2)=4

Step-by-step explanation:

When numerous function evaluations are involved, it is convenient to let a calculator or spreadsheet do them.

The function values that match your answer list are shown above.

3 0
2 years ago
Carolina is making punch for a party. She made 6 bowls of punch. Each bowl holds 2 1/2 gallons of punch. 1 gallon is equal to 4
Roman55 [17]

Answer:

60 people

Step-by-step explanation:

Bowls of Punch = 6

Each bowl holds 2 1/2 gallons of punch

6 bowls = 2 1/2 gallons × 6

= 5/2 × 6 gallons

= 30/2

= 15 gallons

6 bowls of Punch = 15 gallons of Punch

1 gallon = 4 quarts

15 gallons = 4 × 15 quarts

= 60 quarts

6 bowls of Punch = 15 gallons of Punch = 60 quarts of punch

She thinks each person will drink about 1 quart of punch.

How many people will the 6 bowls of punch serve?

6 bowls of Punch = 15 gallons of Punch = 60 quarts of punch

60 quarts of punch / 1 person

= 60 people

The 6 bowls of punch will serve 60 people

5 0
2 years ago
Write an equation of the line passing through the points (3,7) and (-1,-13)
kykrilka [37]

Answer:

Step-by-step explanation:

(-13 - 7)/(-1 + 3) = -20/2 = -10

y - 7 = -10(x - 3)

y - 7 = -10x + 30

y =  - 10x + 37

4 0
3 years ago
Help me with questions please​
Effectus [21]
2290.22mm^2
Hope this helped
6 0
3 years ago
Read 2 more answers
Other questions:
  • 247 + 794 is the same as<br> ? + 800
    12·2 answers
  • Write 39,005 in expanded form
    9·2 answers
  • Please help! If GDEF is a square, GE=4x+1 and DF=8x-51, find the value of x.
    5·2 answers
  • Drawing Conclusions Consider the expression. 6 · 60 · 6–3 Which statements are true about the expression? Check all that apply.
    8·2 answers
  • The ratio of length to weight in Gus's driveway is 13 yards to 4yardd. What is this ratio in feet?
    10·1 answer
  • |a+5|=−a−5, and can you solve |a+5|=a+5 please?
    14·1 answer
  • An area of a triangle is 30cm^2. Side c is 2x + 3 and side b is 4x + 5. The only angle is angle A, 30°. What is the value of x?
    14·1 answer
  • Can someone please help me?
    6·1 answer
  • PLEASE ANSWER I REALLY NEED IT I WILL GIVE 25 POINTS
    7·1 answer
  • Easy question please help
    8·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!