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3 years ago

If 3m equals 129, then what is m? 3m=129 m?

Mathematics

1 answer:

Ksivusya [100]3 years ago

7 0

The answer to the question is 43

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The awnser I’m really have trouble finding a awnser

svlad2 [7]

$A = \pi r^2$
$C=2 \pi r$
$\pi r^2 = 50.24$
$\pi r^2/ \pi =50.24/ \pi$
$r^2 = 16$
$r=4$
$C = 2 \pi r$
$C = 25.13$

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2 years ago

Ana starts eating lunch at 12:15 pm she finishes eating lunch 49 mins later what lock shows the time that Ana finishes eating lu

Oduvanchick [21]

Answer:

What kind of problem? Multiplication? Division? What?

Step-by-step explanation:

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2 years ago

Which word is an antonym of permit?

Deffense [45]

Answer:

What are the options? ban, forbid, prohibit, are some examples

Step-by-step explanation:

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2 years ago

Read 2 more answers

Solve the following recurrence relation: <br> <img src="https://tex.z-dn.net/?f=A_%7Bn%7D%3Da_%7Bn-1%7D%2Bn%3B%20a_%7B1%7D%20%3D

-Dominant- [34]

By iteratively substituting, we have

$a_n = a_{n-1} + n$

$a_{n-1} = a_{n-2} + (n - 1) \implies a_n = a_{n-2} + n + (n - 1)$

$a_{n-2} = a_{n-3} + (n - 2) \implies a_n = a_{n-3} + n + (n - 1) + (n - 2)$

and the pattern continues down to the first term $a_1=0$ ,

$a_n = a_{n - (n - 1)} + n + (n - 1) + (n - 2) + \cdots + (n - (n - 2))$

$\implies a_n = a_1 + \displaystyle \sum_{k=0}^{n-2} (n - k)$

$\implies a_n = \displaystyle n \sum_{k=0}^{n-2} 1 - \sum_{k=0}^{n-2} k$

Recall the formulas

$\displaystyle \sum_{n=1}^N 1 = N$

$\displaystyle \sum_{n=1}^N n = \frac{N(N+1)}2$

It follows that

$a_n = n (n - 2) - \dfrac{(n-2)(n-1)}2$

$\implies a_n = \dfrac12 n^2 + \dfrac12 n - 1$

$\implies \boxed{a_n = \dfrac{(n+2)(n-1)}2}$

4 0

2 years ago

How did astronomer Yi Xing (A.D. 683-727) contribute to the development of mathematics in china?

SSSSS [86.1K]

Answer:

Yi Xing invented the astronomical clock and introduced some new methods of interpolation in mathematics.

Step-by-step explanation:

Yi Xing was both an astronomer and a mathematician during the era. He invented the astronomical clock which was more accurate than the initial water and Sun's clock in use.

Furthermore, Yi Xing also discovered some new methods of interpolation in mathematics of which the meaning and interpretation became controversial. Interpolation is a method majorly in mathematics that can be used to estimate a value of a function from its discrete values. It involves first order differences and second order differences.

Also, Yi Xing was able to design a calendar in A.D. 727.

4 0

3 years ago