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serious [3.7K]
2 years ago
9

Find the area of a circle with a diameter of 8cm.

Mathematics
1 answer:
Elza [17]2 years ago
6 0

Answer:

50.24

Step-by-step explanation:

Area = r^2 x 3.14 (pi)

Radius = 8 ÷ 2 = 4

4² = 16

16 x 3.14 = 50.24

Area = 50.24 cm ²

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AYUDAAA, ES UN EXAMEN PARA HOY!!<br>Lo empiezo a seguir si me dan la respuestas correctas! :)​
Alika [10]

Answer:

1/2 , .5 , 50%

Step-by-step explanation:

7 0
3 years ago
Waves with an amplitude of 2 feet pass a dock every 30 seconds. Write an equation for a cosine function to model the height of a
kolbaska11 [484]

Answer:

The cosine function to model the height of a water particle above and below the mean water line is h = 2·cos((π/30)·t)

Step-by-step explanation:

The cosine function equation is given as follows h = d + a·cos(b(x - c))

Where:

\left | a \right | = Amplitude

2·π/b = The period

c = The phase shift

d = The vertical shift

h = Height of the function

x = The time duration of motion of the wave, t

The given data are;

The amplitude \left | a \right | = 2 feet

Time for the wave to pass the dock

The number of times the wave passes a point in each cycle = 2 times

Therefore;

The time for each complete cycle = 2 × 30 seconds  = 60 seconds

The time for each complete cycle = Period = 2·π/b = 60

b = π/30 =

Taking the phase shift as zero, (moving wave) and the vertical shift as zero (movement about the mean water line), we have

h = 0 + 2·cos(π/30(t - 0)) = 2·cos((π/30)·t)

The cosine function is h = 2·cos((π/30)·t).

4 0
3 years ago
What ratio forms a proportion with 14/42?<br> A. 1/4<br> B. 7/21<br> C. 12/40<br> D. 28/80
koban [17]

Hey there!

"What ratio forms a proportion with \frac{14}{42} ?"

              - \frac{14}{45} =0.56 (for the decimal)

  • A) \frac{1}{4} =0.25 (incorrect)
  • B) \frac{7}{21} =0.33 (Incorrect)
  • C) \frac{12}{40} 0.3 (incorrect)
  • D) \frac{28}{80} 0.7 (incorrect)

But in order for you to solve this particular equation you'd have to go in with two (like multiplying by two)

  • 1\times2= 2 ;   4\times2 = 8 (incorrect)
  • 7\times 2= 14 ; 21\times2 = 42 (correct)
  • 12 \times2 = 24 ; 40\times 2 = 80 (incorrect)
  • 2 \times 28 = 56 ; 2\times 80 = 160 (incorrect)

Your result: \boxed{Answer: B. \frac{7}{21} }

Good luck on your assignment and enjoy your day!

~\bold{LoveYourselfFirst:) }



3 0
3 years ago
Find the value of x<br> A- 6<br> B-5<br> C-4<br> D-10
Snezhnost [94]

Answer:

x=4

Step-by-step explanation:

In triangle MLK

  • it is a equilateral triangle
  • Hence
  • ML=LK=MK=5

Now come to triangle MKJ

  • It is a isosceles triangle
  • Hence
  • MJ=Mk

MK=5

Hence

\longrightarrow\sf MJ=5

\longrightarrow\sf x+1=5

\longrightarrow\sf x=5-1

\longrightarrow\sf x=4

4 0
2 years ago
The relationships for Paul's and Steve's height with respect to Theresa's height are described above. First you will write expre
Makovka662 [10]

Answer:

They are tall, im not sure

5 0
3 years ago
Read 2 more answers
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