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fredorivera
29.09.2019 •
Mathematics
Identify each of the sequences in exercises 22 and 23 as arithmetic or geometric. state a rule for obtaining each number from the preceding number. what is the 12th num- ber in each sequence? 15, 30, 60, 120
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Ответ:
The sequence showed is a Geometric sequence and the 12th number is 30720
Step-by-step explanation:
It's a geometric sequence because there's a ratio, which we can multiply for any number and we'll get the next.
In the case showed the ratio is 2, for example
15x2=30
30x2=60
...
Then we can apply the following formula to find the n number of the sequence:
Where
an= number we want to find
a1= first number of the sequence
r=ratio
In this case we have a ratio=2 and we want to find the 12th number:
Ответ:
x = 6
Step-by-step explanation:
let second number be - x
let the onr number be - 2x + 6
x + 2x + 6 = 42
3x + 6 = 42
3x = 42 -6
3x = 36
x = 36/6
x = 6