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3 years ago

Circumference of the circle

Mathematics

2 answers:

lutik1710 [3]3 years ago

8 0

Step-by-step explanation:

The formula for calculating a circle's circumference is πd, where π is an irrational number (3.14....) and d is the diameter of the circle.

In the circle with diameter 19.5cm, the circumference is around 3.14 * 19.5cm = 61.23cm. (A)

stealth61 [152]3 years ago

8 0

Answer:

61.2

Step-by-step explanation:

circumference= 2πR

r=d/2

r= 19.5/2

r=9.75

circumference= 2×3.14×9.75

circumference= 61.2

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Two sections of a class took the same quiz. Section A had 15 students who had a mean score of 80, and Section B had 20 students

Alex17521 [72]

Answer:

85.7

Step-by-step explanation:

Given that two sections of a class took the same quiz. Section A had 15 students who had a mean score of 80, and Section B had 20 students who had a mean score of 90.

Section A total score = 15*80=1200

Section B total score 20*90 = 1800

Overall total score=3000

Overall total students = 15+20 =35

Hence overall mean = $\frac{3000}{35} \\=85.7143$

rounding off to one decimal place

overall mean = 85.7

7 0

4 years ago

40% =32/ what is the full fraction

Levart [38]

40% = 32/x

Rewrite using a decimal

.40 = 32 / x

Multiply both sides by x
.40x = 32

Divide both sides by .40
x = 32 / .40
x = 80

Write the full fraction
32/80

Answer 32/80

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3 years ago

Which expression is equivalent to (144k^2r^14)1/2 for all positive values of k and r?

FrozenT [24]

Answer: B

Step-by-step explanation:

4 0

3 years ago

Can someone help me with this please

ryzh [129]

Answer:

y=4

Step-by-step explanation:

You can ignore the 3 and 6 because this has no y value change(rise over run)

This is a straight horizontal line so the equation is y=4.

Slope=0

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2 years ago

(x-5)2/5=4 Solve the equation.

Naddika [18.5K]

Answer: x=15

Step-by-step explanation:

3 0

3 years ago

Read 2 more answers