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Romashka-Z-Leto [24]
4 years ago
10

PLEASE HELP ME IM BEGGING U THIS IS URGENT, PLEASE ASAP, NO NEED TO EXPLAIN JUST ANSWER PPLZZZZZZ

Mathematics
2 answers:
statuscvo [17]4 years ago
7 0
25% of something is 5000000, so total is 4*5000000 = 20 million
BARSIC [14]4 years ago
4 0
X/4 = 5 million
x = 20 million
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64%

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5 0
3 years ago
the first n terms of the progression. The first term and common difference of an arithmetic progression are a and -2. respective
AlladinOne [14]

If <em>a</em> is the first term of an AP with common difference -2, then the first several terms are

<em>a</em>, <em>a</em> - 2, <em>a</em> - 4, <em>a</em> - 6, <em>a</em> - 8, …

with <em>n</em>-th term <em>a</em> - 2 (<em>n</em> - 1).

The sum of the first <em>n</em> terms is equal to the sum of the first 3<em>n</em> terms :

\displaystyle \sum_{i=1}^n (a-2(i-1)) = \sum_{i=1}^{3n} (a-2(i-1))

We have

\displaystyle \sum_{i=1}^N (a-2(i-1)) = (a+2)\sum_{i=1}^N - 2\sum_{i=1}^Ni = (a+2)N - 2\cdot\dfrac{N(N+1)}2 = (a+1)N-N^2

so that in the previous equation, the sums reduce to

(a+1)n-n^2 = (a+1)(3n)-(3n)^2

Solve for <em>a</em> :

(a+1)n-n^2 = (a+1)(3n)-(3n)^2 \\\\ (a+1)n-n^2 = (a+1)(3n)-9n^2 \\\\ 9n^2-n^2 = (a+1)(3n)-(a+1)n \\\\ 8n^2 = (a+1)(2n) \\\\ 4n = a+1 \\\\ \boxed{a=4n-1}

Now if <em>a</em> = 27, we have

27 = 4<em>n</em> - 1

28 = 4<em>n</em>

<em>n</em> = 7

as required.

7 0
2 years ago
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