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
nikklg [1K]
4 years ago
13

The area of a circle is found using the formula A=\pi r^(2) , where r is the radius. If the area of a circle is 36π square feet,

what is the radius, in feet? A. 6 B. 6π C. 18 D. 9π
Mathematics
1 answer:
Studentka2010 [4]4 years ago
8 0

Answer:

<h2> A. 6 feet</h2>

Step-by-step explanation:

A=\pi r^2\\Area = 36\pi\\r = ?\\36\pi = \pi r^2\\Divide \:both \:sides \:of\: the \:equation\: by\: \pi\\\frac{36\pi}{\pi} = \frac{\pi r^2}{\pi} \\r^2 = 36\\Find\: the\: square\: root\: of\: both\: sides\: \\\sqrt{r^2} =\sqrt{36} \\\\r = 6\: feet\\

You might be interested in
The radius of a car wheel is 14 inches. how many revolutions per minute is the wheel making when the car is traveling at 60 mph.
Dovator [93]

Answer:

721\ \frac{rev}{min}

Step-by-step explanation:

step 1

Find the circumference of the wheel

The circumference of a circle is equal to

C=2\pi r

we have

r=14\ in

substitute

C=2\pi(14)

C=28\pi\ in

assume

\pi=3.14

C=28(3.14)=87.92\ in

step 2

1\ mile=63,360\ inches

1\ hour=60\ minutes

we have that

The speed of the car is 60 miles/hour

Convert the speed to inches/minute

60\ \frac{mi}{h}=60(\frac{63,360}{60})=63,360\ \frac{in}{min}

step 3

Remember that

The circumference of the wheel subtends one revolution

so

1\ rev=87.92\ in

Convert the speed to rev/min

63,360\ \frac{in}{min}=\frac{63,360}{87.92}=721\ \frac{rev}{min}

3 0
3 years ago
The table shows the average change in the water level of a reservoir for the last three years.
iren [92.7K]

Answer:

-1.5

Step-by-step explanation:

-1 1/4 + 3/4= -0.5

-0.5-1= -1.5

7 0
3 years ago
Read 2 more answers
What is the answer to this quadratic equation? <br> X^2 -26x +195=51
antoniya [11.8K]

Answer:

Either   x=18                  or       x=8

Step-by-step explanation:

To find the answer to this quadratic equation, we will follow the steps below:

X² -26x +195=51

Subtract 51 from both-side of the equation

X² -26x +195-51 =51 - 51

X² -26x +144 = 0

comparing the above  with the standard equation

ax² + bx + c=0

a = 1  b = -26   c= 144

Using the quadratic formula

x = -b ± √b² - 4ac /2a

x = -(-26) ± √(-26)² - 4(1)(144)   /2(1)

x = 26  ± √676 - 576   /2

x = 26  ± √100   /2

x = 26  ± 10   /2

Either  x= 26+10  /2        or    x =26-10  /2

Either  x =36/2               or      x=16/2

Either   x=18                  or       x=8

7 0
3 years ago
What is the volume of this sphere?
Orlov [11]

nswer:

44

Step-by-step explanation:

5 0
3 years ago
Read 2 more answers
I DONT HAVE A COMPASS SO I NEED HELP. PLEASE AND THANK YOU!
Fiesta28 [93]

Answer:

The figure is rotated 180 degrees. Also we don't use "compasses" in math.

Step-by-step explanation:

6 0
3 years ago
Other questions:
  • The angle measures associated with which set of ordered pairs share the same reference angle
    13·2 answers
  • An air conditioning system can circulate 280 cubic feet of air per minute. How many cubic yards of air can it circulate per​ min
    9·2 answers
  • If P = (3,4), Find: Rx=1 (P)
    10·1 answer
  • A rectangle has a width of 12 ft and a length of 4 ft.
    9·2 answers
  • Suppose a social networking site has roughly 1,000,000 users, and as each
    12·1 answer
  • Two angles in a triangle are 30° and 35°. What type of angle is the other?
    15·2 answers
  • Bo is buying candy by the pound. For every 10 pounds, he pays $23. What is the cost per pound?
    5·2 answers
  • HURRYYYYY !!!!! Examine the following expression. p squared minus 3 + 3 p minus 8 + p + p cubed Which statements about the expre
    12·1 answer
  • What percent of 66 is 13 help please​
    13·1 answer
  • Horst pulled pizza out of the oven and cut it into 4 equivalent pieces. He ate two of them. his sister came in and cut one of th
    12·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!