3 years ago

2,3,1,-2,-3, ....

Mathematics

2 answers:

My name is Ann [436]3 years ago

7 0

The sum of the fust 20 terms in the sequence is 5 because williamwu309 said so

Andreyy893 years ago

5 0

Well, the best way to solve this is maybe just to find a pattern, so 2, 3, 1, -2, -3, -1, 2, 3, 1, -2, -3, -1, so we find out that it repeats and the sum is 0 every 6 terms! Now that we know this, We can just find out the last two digits, which are 2 and 3. So $2 + 3 =$ 5, which is our answer

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How to solve this substitution

Lena [83]

-5x+4y=11
substitute for x which is 5
(-5)(5)+4y=11

simplify :
4y-25=11

add 25 on both sides
4y-25=11
+25 +25
the 25 cancels out

so it would be 4y=36
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4/4 =36/4

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