140007625
30.07.2020 •
Mathematics
for a certain sequence of numbers the sum of the first n numbers in the sequence is given by n^3 + 4n for all positive integers n. what is the tenth number in the sequence
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Ответ:
1040
Step-by-step explanation:
10^3+4(10)=
1000+40=
1040
Ответ:
multiply first equation by 3 and 2nd by 4 and add them
15x+12y=24
8x-12y=68 +
23x+0y=92
23x=92
divide both sides by 23
x=4
the x value is 4