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3 years ago

I have to methods of doing these and neither are right.

Mathematics

2 answers:

iragen [17]3 years ago

8 0

Answer:

arc length AB = 3π

Step-by-step explanation:

arc angle = 20°

which represents 20/360 of the circumference

arc length = (20/360) x 2πr

= (20/360) x 2 x π x 27

= 3π

Slav-nsk [51]3 years ago

3 0

Answer:

3π

Step-by-step explanation:

Your first answer is correct, but it is not in terms of pi.

20 / 360 = x / (2π • 27)

20 / 360 = x / (54π)

360 x = 1080π

x = 3π ≈ 9.4

Your second method is correct, but you accidentally wrote 1/8 instead of 1/18 when you simplified 20/360.

2π • 27 • 20/360

2π • 27 • 1/18

54π • 1/18

3π

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Answer:

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Step-by-step explanation:

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2 years ago

If the mean heights of three groups of students consisting of 20,16 and 14 students are 167m, 150m and 1.40m respectively find t

Aleonysh [2.5K]

Answer:

1.54 m

Step-by-step explanation:

Given information:

Three groups of students

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16 students with a height of 1.50 m
14 students with a height of 1.40 m

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To find the mean height of all the students, divide the sum of all the students' heights by the total number of students:

$\begin{aligned}\implies \sf mean\:height & =\dfrac{(20 \times 1.67)+(16 \times 1.50)+(14 \times 1.40)}{50}\\\\ & = \dfrac{33.4+24+19.6}{50}\\\\ & = \dfrac{77}{50}\\\\ & = 1.54\:\: \sf m\end{aligned}$

Therefore, the mean height of all the students is 1.54 m

6 0

1 year ago

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12,781 rounded to the nearest hundred?

Dominik [7]

12800
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2 years ago

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Answer:

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Hunter-Best [27]

Answer:

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2 years ago