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
telo118 [61]
2 years ago
11

Find the radius of a circle with area 42 square feet

Mathematics
1 answer:
Nimfa-mama [501]2 years ago
6 0

Answer:

Step-by-step explanation:

area of a circle=πr^2

42=3.14*r^2

42/3.14=r^2

13.37=r^2

\sqrt{13.37=r

3.65=r

3.7=r

therefore radius of a circle is 3.7 ft

You might be interested in
Write the equation of each line using the given information.
Marat540 [252]

A. The equation of the line is y = -0.2 x + 1.9

B. The equation of the line is y = 4 x + 3

C. The equation of the line is y = -8

D. The equation of the line is y = 2 x + 4

Step-by-step explanation:

The slope-intercept form of the equation of a line is y = m x + b, where

m is the slope of the line and b is the y-intercept

  • The formula of the slope of a line which passes through points (x_{1},y_{1}) and (x_{2},y_{2}) is m=\frac{y_{2}-y_{1}}{x_{2}-x_{1}}
  • The slope of a horizontal line whose equation y = b is zero
  • The y-intercept means the line intersect the y-axis at point (0 , b)

A.

∵ The line passes through points (2 , 1.5) and (-5 , 36.5)

∴ x_{1} = 2 and x_{2} = -5

∴ y_{1} = 1.5 and y_{2} = 36.5

∵ m=\frac{y_{2}-y_{1}}{x_{2}-x_{1}}

∴ m=\frac{-5-2}{36.5-1.5}=\frac{-7}{35}=\frac{-1}{5}

∴ m = -0.2

∵ y = m x + b

∵ m = -0.2

∴ y = -0.2 x + b

- To find b substitute x and y in the equation by the coordinates of

  one of the two given points

∵ x = 2 and y = 1.5

∴ 1.5 = -0.2(2) + b

∴ 1.5 = - 0.4 + b

- Add 0.4 to both sides

∴ 1.9 = b

∴ y = -0.2 x + 1.9

The equation of the line is  y = -0.2 x + 1.9

B.

∵ m = 4

∵ y = m x + b

∴ y = 4 x + b

∵ Point (3 , 15) lies on the line

- To find b substitute x and y in the equation by the coordinates

  of the given point

∵ x = 3 and y = 15

∴ 15 = 4(3) + b

∴ 15 = 12 + b

- Subtract 12 from both sides

∴ 3 = b

∴ y = 4 x + 3

The equation of the line is y = 4 x + 3

C.

∵ The line has the same slope of line y = 1

- The line whose equation y = 1 is a horizontal line

∵ The slope of the line y = 1 is zero because it is a horizontal line

∴ m = zero

∵ y = m x + b

∴ The equation of the line is y = (0)x + b

∴ y = b

∵ The line passes through point (3 , -8)

- In the horizontal line the y-coordinates of all point lie on the line

  are equal

∴ The line intersect the y-axis at point (0 , -8)

∴ b = -8

∴ y = -8

The equation of the line is y = -8

D.

∵ m = 2

∵ y-intercept is at point (0 , 4)

∴ b = 4

∵ y = m x + b

∴ y = 2 x + 4

The equation of the line is y = 2 x + 4

Learn more:

You can learn more about the linear equations in brainly.com/question/4326955

#LearnwithBrainly

6 0
2 years ago
Question in picture<br> correct answer marked brainliest
sergejj [24]
C because you need to use the formula and then calculate
7 0
2 years ago
A publishing company has a weekly cost equation of C=96,000+20x and a weekly revenue equation of R=26​x, where x is the number o
almond37 [142]
Sent a picture of the solution to the problem (s).

8 0
3 years ago
Write 21e-10 in standard form.
____ [38]

Answer:

you cant put this equation in standard form

Step-by-step explanation:

8 0
2 years ago
15. Alex bought a 711 foot tree. When he got it home, he cut 1
kolbaska11 [484]

Answer:

this other dudes answer don’t make any sense

4 0
3 years ago
Other questions:
  • Irene knows there are 22 cups in 11 pint. She writes the equation c=2pc2p to find the number of cups, cc, in any number of pints
    11·2 answers
  • Jillian exercises 5 times a week she runs 3 miles each morning and bikes in the evening if she exercises a total of 30 miles for
    5·2 answers
  • Describe how you would use a yardstick to measure a length of a rug
    10·2 answers
  • A set of n = 15 pairs of X and Y scores has SSX = 10, SSY = 40, and SP = 30. What is the slope for the regression equation for p
    5·1 answer
  • The difference between a number x and 16 is 21
    11·1 answer
  • The simple interest formula is A = P(1 + r)t where P represents the amount originally deposited, r is the interest rate, and A i
    5·1 answer
  • For which number does the 9 have the least value 9.001, 0.9, 0.29, 7.079
    12·1 answer
  • Confusedddddddddddddddd
    15·1 answer
  • Order these numbers from least to greatest.<br> 17<br> 9<br> 8.49,8<br> 20<br> 7.479,<br> 2
    7·2 answers
  • Help, I don't want to lose my answer streak.
    6·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!