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2 years ago

A class has 28 students 13 boys and 15 girls what is rstio girls to boys

Mathematics

1 answer:

never [62]2 years ago

7 0

Answer:

15 : 13

Step-by-step explanation:

Girls : Boys

15 : 13

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4x – 8(2 - x) when x = 1/4?

Hitman42 [59]

Answer: -13

Step-by-step explanation:

= 4*(1/4) - 8(2-1/4)

= 1-8(7/4)

= 1-14

= -13

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3 years ago

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Which number is irrational A. 2.7 B. -2. 7 C. 2/7 D. √7

pashok25 [27]

Answer:

Step-by-step explanation:

because $\sqrt{7}$ is radical

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3 years ago

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What is the general term equation, an, for the arithmetic sequence 5, 1, â3, â7, . . . , and what is the 21st term of this seque

Valentin [98]

Hello :

the nth term ( general term of an arithmetic sequence is :

An =A1+(n-1)d ....a common difference is : d , A1 : the first terme
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A21 = 5 + (21 -1)(-4)
A21 = 5 - 80 = -75

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3 years ago

The expression 146 ÷ 144 is equal to _____.

natulia [17]

Answer:1.01

Step-by-step explanation:

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3 years ago

Part I: Measuring Parts of a Circle

cluponka [151]

Answer:

case a) The approximate circumference of circle is $5.9\ units$ and the ratio of circumference to Diameter is $\frac{C}{D}=2.95$

case b) The approximate circumference of circle is $6\ units$ and the ratio of circumference to Diameter is $\frac{C}{D}=3$

case c) The approximate circumference of circle is $6.24\ units$ and the ratio of circumference to Diameter is $\frac{C}{D}=3.12$

Step-by-step explanation:

we know that

The approximate circumference of each circle, is equal to the perimeter of each inscribed polygon

case A) the figure is an inscribed pentagon

step 1

Find the approximate circumference of circle

The perimeter of the pentagon is equal to

$P=5s$

where

$s=1.18\ units$

substitute

$P=5(1.18)=5.9\ units$

therefore

The approximate circumference of circle is $5.9\ units$

step 2

Find the ratio of circumference to Diameter

we know that

The radius is half the diameter so

$D=2r=2(1)=2\ units$

The ratio is equal to

$\frac{C}{D}=5.9/2=2.95$

case B) the figure is an inscribed hexagon

step 1

Find the approximate circumference of circle

The perimeter of the hexagon is equal to

$P=6s$

where

$s=1\ units$

substitute

$P=6(1)=6\ units$

therefore

The approximate circumference of circle is $6\ units$

step 2

Find the ratio of circumference to Diameter

we know that

The radius is half the diameter so

$D=2r=2(1)=2\ units$

The ratio is equal to

$\frac{C}{D}=6/2=3$

case C) the figure is an inscribed dodecahedron

step 1

Find the approximate circumference of circle

The perimeter of the dodecahedron is equal to

$P=12s$

where

$s=0.52\ units$

substitute

$P=12(0.52)=6.24\ units$

therefore

The approximate circumference of circle is $6.24\ units$

step 2

Find the ratio of circumference to Diameter

we know that

The radius is half the diameter so

$D=2r=2(1)=2\ units$

The ratio is equal to

$\frac{C}{D}=6.24/2=3.12$

<em>Conclusion</em>

We know that

The exact value of the ratio $\frac{C}{D}$ is equal to

$\frac{\pi D}{D}=\pi$

The approximate value of the circumference will be closer to the real one when the number of sides of the inscribed polygon is greater

4 0

3 years ago