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2 years ago

Please help, I really need to know how to do it

Mathematics

2 answers:

docker41 [41]2 years ago

7 0

Answer: It is roughly 25.12 or 8π

Step-by-step explanation:

Well, it depends if you are using 3.14 as a subsitute for Pi, or you are just using the Pi symbol (π). Let me explain better:

The equation for solving the circumference of a circle is C=2πr

R is the radius, which is the 4 in the problem. If you were just using the Pi symbol, you would multiply 2*4 because you plugged 4 into the equation above. This would result in C=8π.

If you were using 3.14, you would subsitute both 3.14 and 4. So it would be C=2(3.14)(4) which would be 25.12

Hope this helped! (By the way, if it is wrong, I have not gotten this in my math class yet). ALSO remember to check whether the homework is using 3.14 for Pi or you just using the Pi symbol. And to put the squiggly equation symbol which means about.

nirvana33 [79]2 years ago

4 0

Answer:

So heres what I think

C=2pie r

C=2*3.14*4

c=25.12

So basically half the circle is the radius and the whole is the circumference. So what you are doing is changing pie to 3.14 (since pie=3.14), since half the circle its radius so all you have to do is 2 times 3.14 times 4 to get 25.12 as your circumference.

Hope this helps!

Step-by-step explanation:

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Line segment NY has endpoints N(-11, 5) and Y(3,-3).

777dan777 [17]

Given:

Line segment NY has endpoints N(-11, 5) and Y(3,-3).

To find:

The equation of the perpendicular bisector of NY.

Solution:

Midpoint point of NY is

$Midpoint=\left(\dfrac{x_1+x_2}{2},\dfrac{y_1+y_2}{2}\right)$

$Midpoint=\left(\dfrac{-11+3}{2},\dfrac{5-3}{2}\right)$

$Midpoint=\left(\dfrac{-8}{2},\dfrac{2}{2}\right)$

$Midpoint=\left(-4,1\right)$

Slope of lines NY is

$m=\dfrac{y_2-y_1}{x_2-x_1}$

$m=\dfrac{-3-5}{3-(-11)}$

$m=\dfrac{-8}{14}$

$m=\dfrac{-4}{7}$

Product of slopes of two perpendicular lines is -1. So,

$m_1\times \dfrac{-4}{7}=-1$

$m_1=\dfrac{7}{4}$

The perpendicular bisector of NY passes through (-4,1) with slope $\dfrac{7}{4}$ . So, the equation of perpendicular bisector of NY is

$y-y_1=m_1(x-x_1)$

$y-1=\dfrac{7}{4}(x-(-4))$

$y-1=\dfrac{7}{4}(x+4)$

$y-1=\dfrac{7}{4}x+7$

Add 1 on both sides.

$y=\dfrac{7}{4}x+8$

Therefore, the equation of perpendicular bisector of NY is $y=\dfrac{7}{4}x+8$ .

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In a group of eighteen people, each person shakes hands once with each other person in the group. How many handshakes will occur

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The number of handshakes that will occur in a group of eighteen people if each person shakes hands once with each other person in the group is 153 handshakes

In order to determine the number of handshakes that will occur among 18 people, that is, the number of ways we can choose 2 persons from 18 people.

∴ The number of handshakes = $^{18}C_{2}$