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Licemer1 [7]
4 years ago
12

Earths circumference is approximately 25,000 miles. If you could dig a tunnel to the center of earth, how long will the title be

? Round to the nearest 10th mile.
Mathematics
1 answer:
shtirl [24]4 years ago
3 0

Answer:

r ≈ 3,980 miles

Step-by-step explanation:

C = 2 r π

C = 25,000

r = C / (2π) = 25,000 / (2π)

r = 3,978.87357678

r ≈ 3,980 miles

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Hi. Please I need help with these questions.
VashaNatasha [74]

9514 1404 393

Answer:

  21x² +20x +100 = 0

Step-by-step explanation:

We know the sum of the roots of x² +bx +c = 0 is -b, and their product is c. If the roots are α and β, then ...

  • α+β = -b
  • αβ = c

The sum of the roots of the new equation will be ...

  -b' = (α+1/β)+(β+1/α) = (α+β) +(1/α +1/β) = (α+β)(1 +1/(αβ))

The product of the roots of the new equation will be ...

  c' = (α+1/β)(β+1/α) = αβ +2 +1/(αβ)

Using the above relations for (α+β) and αβ, we find that ...

  -b' = (-b)(1 +1/c)

  c' = c + 2 + 1/c

For the given equation, our definition of b and c is ...

  b = 2/3

  c = 7/3

so the new equation has values ...

  b' = (2/3)(1 + 1/(7/3) = (2/3)(10/7) = 20/21

  c' = 7/3 + 2 + 1/(7/3) = 13/3 + 3/7 = 100/21

So, the equation with the roots of interest is ...

  x² +20/21x +100/21 = 0

Multiplying by 21 gives ...

  21x² +20x +100 = 0

4 0
3 years ago
Suppose that
juin [17]
2000 dollars is owed with 9% interest rate.
Now, assuming that for 10 years, it is not being paid.
Let's calculate for the money that is now owed.
=> 2000 dollars * . 09 = 180 dollars for 1 years
=> 180 dollars * 10 years = 1800 dollars 
=> 2000 + 1800 = 3800 dollars for 10 years.
6 0
3 years ago
The number below has 4 as afactor. What could the unknown digit be?<br> 3,2 6
MrRissso [65]

Answer:

8

Step-by-step explanation:

5 0
3 years ago
Write the fraction as a decimal.1/8
laila [671]
The easiest way to find out is with a calculator.
0.125 = 1/8=1÷8
5 0
3 years ago
Please help and explain!! I really don't get this
const2013 [10]
Average rate of change means find the slope of the secant line. So if there is a function f(x) and you want to find the average R.O.C over the interval [a,b], it would be (f(b)-f(a))/(b-a)

1. (f(3)-f(1))/(3-1)= (0-(-2))/2= 1, so D.

2. Same concept; (8-4)/(3-1)=2, so A.

3. Again, (39-(-1))/5= 8, B.
6 0
4 years ago
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