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3 years ago

What is the exact circumference of a circle with a radius of 125 m? Use 3.14 to approximate pi

Mathematics

2 answers:

Aleks [24]3 years ago

7 0

Answer:

b)785

Step-by-step explanation:

a website called math.w.ay is my source :)

djyliett [7]3 years ago

4 0

Answer:

B. 785 M

Step-by-step explanation:

Circumference = 2*pi*r

C = 2 * pi * 125

C = 250pi This is the exact answer

Now approximating with pi as 3.14

C = 250 (3.14)

C = 785

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A sports magazine claims that in a certain country, 45% of people like soccer A news channel asked 30 randomly selected people i

LiRa [457]

Answer:

Step-by-step explanation:

Hello!

The parameter of interest is "the population proportion of people that like soccer A news channel"= p

The hypothesis are:

H₀: p = 0.45

H₁: p ≠ 0.45

To study the population proportion you have to use the approximation of the standard normal distribution:

$Z= \frac{p'-p}{\sqrt{\frac{p(1-p)}{n} } }$ ≈ N(0;1)

A sample of n=30 was taken and surveyed, 18 of those answered positively, then the sample proportion is:

p'= 18/30= 0.6

The statistic under the null hypothesis is:

$Z_{H_0}= \frac{0.60-0.45}{\sqrt{\frac{0.45*0.55}{30} } } = 1.6514$

I hope it helps!

6 0

3 years ago

What is f(4) if f(x)=|3x+4|-2

alex41 [277]

Okay so just put the 4 in for x
and multiply

5 0

3 years ago

-30 = -16 + N what is he answer to this

marta [7]

Answer:

Step-by-step explanation:

To solve for the given variable $N$ , we need to get $N$ on one side of the equation by itself. To do so, we need to remove the -16 that is on the same side of the variable.

To get rid of the -16, we can add a 16 to that side of the equation since $-16 + 16 = 0$ , which will get $N$ by itself; however, if we add -16 to one side of the equation, we must add it to both sides of the equation:

$-30 + 16 = -16 + 16 + N$

$-14 = N$

4 0

3 years ago

Tom determines the system of equations below has two solutions, one of which is located at the vertex of the parabola.

Rus_ich [418]

Answer:

b must equal 7 and a second solution to the system must be located at (2, 5).

Step-by-step explanation:

Rearranging the first equation:

y = (x - 3)^2 + 4

From this we see that the vertex is at the point (3,4).

So one solution of equation 2 is (3 ,4).

Substituting in equation 2:

4 = -3 + b

b = 7.

So equation 2 is y = - x + 7.

Now we check if (2, 5) is on this line:

5 = -2 + 7 = 5 , therefore (2, 5) is on this line.

Verifying if (2, 5) is also on y = (x - 3)^2 + 4:

5 = (2 - 3)^2 + 4 = 1 + 4 = 5

- so it is. and a second solution to the system is (2, 5).

5 0

3 years ago

Find the perimeter of the trapezoid

Olin [163]

Answer:

1st slot: 12

2nd slot: 48

Step-by-step explanation:

Hope this helps!

8 0

3 years ago