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
olga nikolaevna [1]
3 years ago
11

Whats the circumference of a circle with a radius of 21 meters

Mathematics
2 answers:
r-ruslan [8.4K]3 years ago
8 0

Answer:

131.88 m^2

Step-by-step explanation:

Circumference formula: 2pi × radius

2 × 3.14 = 6.28

6.28 × 21 = 131.88

Bogdan [553]3 years ago
7 0

Answer:

C =131.88 meters

Step-by-step explanation:

The circumference of a circle is given by

C = 2*pi*r

where r is the radius

C = 2 * pi * 21

C = 42 pi

If we approximate pi by 3.14

C = 42(3.14)

C =131.88 meters

You might be interested in
What percentage of this shape is shaded?
Lilit [14]

Answer:

50%

Step-by-step explanation:

8 0
3 years ago
John is parasailing 350 ft away from the boat that pulls him. suppose he is lifted 400 feet into the air. Find the length of the
ohaa [14]
John
| \
| \
|. \
|. \
(a)400ft
|. \
|. \
|. \(c) length of rope
|. \
|. \
|____________________Boat
350 ft (b)

Pythagorean theorem
a-squared + b-squared = c-squared
400-squared + 350-squared = c-squared
160,000 + 122,500 = c- squared
282,500 = c-squared
Now take the square root of each side of the equation
531.5 = c
The length of the rope is 531.5 feet
7 0
3 years ago
A forester wishes to predict the volume (in cubic feet) of usable lumber in a certain species of tree using the height (in feet)
alex41 [277]

Answer: The response variable = Volume

and explanatory variable(s) in this study are: Height and Diameter.

Step-by-step explanation:

Important definitions:

  • The explanatory variable is a type of independent variable manipulated by the experimenter for the ongoing experimental study.
  • The response variable is a type of dependent variable which depends on the explanatory values provided by the experimenter.

Given: A forester wishes to predict the volume (in cubic feet) of usable lumber in a certain species of tree using the height (in feet) and diameter (in inches) of the trees.

Here, Volume directly depends upon the height and diameter of the tree.

Also, forester ( Experimenter) wants to predict volume by cutting tree that means it is an response variable and it depends on height and diameter , so height and diameter are explanatory variable.

Hence, The response variable = Volume

and explanatory variable(s) in this study are: Height and Diameter.

7 0
3 years ago
Using complete square to slove for x in the equation (x+7) (x-9)=25
Brrunno [24]

Answer:

x_1=1+\sqrt{89}\\\\x_2=1-\sqrt{89}

Step-by-step explanation:

Apply Distributive property:

(x+7)(x-9)=25\\\\x^2-9x+7x-63=25

Add like terms and then add 63 to both sides of the equation:

x^2-2x-63=25\\\\x^2-2x-63+63=25+63\\\\x^2-2x=88

Pick the coefficient of the x term, divide it by 2 and square it:

(\frac{2}{2})^2=1

Add it to both sides of the equation:

x^2-2x+1=88+1

Rewriting the left side as a squared binomial, we get:

(x-1)^2=89

Apply square root to both sides:

\sqrt{(x-1)^2}=\±\sqrt{89}\\\\x-1=\±\sqrt{89}

And finally we need to add 1 to both sides of the equation. Then we get:

x-1+1=\±\sqrt{89}+1\\\\x=\±\sqrt{89}+1\\\\\\x_1=1+\sqrt{89}\\\\x_2=1-\sqrt{89}

8 0
3 years ago
PLZZZZZZZZZZZZZZZZZ HELPPPPPP!!!!!!!!!!!!!!!!!!!!!
olchik [2.2K]
No problem just send those goldfish pics and some of those trash pics answer is 10
6 0
3 years ago
Other questions:
  • Sean's mom asks him how long his homework will take. He tells her that he needs to read for 25 minutes and also do some math pro
    7·1 answer
  • Y=2x+4<br> y=x=6<br> i need help solving the system of equations
    6·1 answer
  • A car dealership pays $8,350 for a car. They mark up the prices by 17.4% to get the retail price. What is the retail price of th
    8·1 answer
  • Angle homework , help fasttt thanksss
    6·1 answer
  • 2. Shawn has to pay 5% sales tax on his $500 purchase. How much tax will<br> Shawn pay?
    5·2 answers
  • Jordan gets paid to mow his neighbor's lawn. For every week that the mows the lawn, he earns $20. Write a rule as an algebraic e
    8·1 answer
  • If the suspect is found guilty, then he will go to prison.
    11·1 answer
  • What is the distance between this two points (-8, 7) and (5, 7)
    5·1 answer
  • 7x9=7x5+7x= <br> Please help i’m on a test
    14·1 answer
  • I really need help this is due today!!!!
    15·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!