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
WITCHER [35]
2 years ago
8

What is the area of the circle of radius 9

Mathematics
2 answers:
fredd [130]2 years ago
7 0
I hope I'm reading this right but the circle has a radius of 9?

a = π r²

81π  or 254.34
erma4kov [3.2K]2 years ago
4 0
The equation for the area of a circle is: \pi r^2 . Insert 9 as your radius (r) into the equation and solve:
\pi 9^2 = 254.469
You might be interested in
In an insect colony there are 270 insects after 9 days. If there were initially 80 insects how long will it take the population
Semenov [28]

Answer:

The time it will take the population to grow to 800 insects is 17 days.

Step-by-step explanation:

The growth function of the insects is exponential.

The exponential growth function is:

y=a(1+r)^{t}

Here,

<em>y</em> = final value

<em>a</em> = initial value

<em>r</em> = growth rate

<em>t</em> = time taken

It is provided that there were 270 insects after 9 days and initially there were 80 insects.

Compute the value of <em>r</em> as follows:

y=a(1+r)^{t}\\\\270=80(1+r)^{9}\\\\3.375=(1+r)^{9}\\\\\ln(3.375)=9\cdot \ln(1+r)\\\\0.135155=\ln(1+r)\\\\1+r=1.14471\\\\r=0.145

Now, compute the time it will take the population to grow to 800 insects as follows:

800=80(1+0.145)^{t}\\\\10=(1.145)^{t}\\\\\ln(10)=t\cdot \ln(1.145)\\\\t=17.00522\\\\t\approx 17

Thus, the time it will take the population to grow to 800 insects is 17 days.

7 0
3 years ago
Pls answer with real answers only thank you
aev [14]
Answer: 32.35 cm^2

Step by step:

Find the area of the rectangle first.

A= L • W
A= 11 • 4.2
A= 46.2 cm^2

Then find the area of the circle. The formula is A= pi (r)^2. The diameter of the circle is 4.2 cm because looking at the width of the rectangle it fits into the circle as well.

Half of the diameter is 2.1 cm which is the radius.

A= pi (r)^2
A= pi (2.1)^2
A= pi (4.41)
A= 13.85 cm^2

Then you would subtract 13.85 from 46.2 to find the shaded portion.

Hope this helps :))

4 0
2 years ago
Kesha rode her bike 12 miles from home to the store. She rode her bike back towards home from the store for 8 miles then walked
stellarik [79]

Answer:

0 Kesha is already home 8+4 is 12 and it's 12 miles from the store to her house .-.

Step-by-step explanation:

5 0
3 years ago
Read 2 more answers
Write this ratio in simplest form: 72:9​
elena55 [62]

Answer:

12

Step-by-step explanation:12x9

3 0
2 years ago
Read 2 more answers
Can someone please answer theses 2 short questions? I’m in a hurry.
MariettaO [177]
Top is 282/1000 idk bottom one though I’m in a hurry too but you have to simplify the first one
8 0
2 years ago
Other questions:
  • Latoya performs an experiment using the lab equipment shown.
    5·2 answers
  • alex needs to buy compressed air to fill 5 empty cylindrical tanks for his store. each tank is 12 feet deep and has a radius of
    15·1 answer
  • How would you get y by it's self​
    11·2 answers
  • At the start of 2014 lucy’s House was worth £200,000. the value of the house increased by 5% every year . Work out the value of
    8·2 answers
  • What percentage of the data values falls between the values of 27 and 45 in the data set shown?
    12·2 answers
  • Help me solve this <br> Step by step<br> 1/2(y+2)+2=1/4(8y-60)-3
    6·1 answer
  • Given the equation -4x+3y=-17 find the value of y if the ordered pair (2,y) is a solution
    5·1 answer
  • Helpppp pleaseeeee summer school needs done
    12·1 answer
  • Which is the largest three-digit number of the form 9k + 1, where k is any positive integer?​
    8·1 answer
  • What is the value of the function f(x) = 2x + 3 for an input value of 3? (a)6(b) 12(c) 3 (d)9
    10·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!