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FatCatcreator
02.07.2019 •
Mathematics
Could someone answer and explain these ? you!
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Ответ:
Answer 1:
It is given that the positive 2 digit number is 'x' with tens digit 't' and units digit 'u'.
So the two digit number x is expressed as,
The two digit number 'y' is obtained by reversing the digits of x.
So,![y=(10 \times u)+(1 \times t)](/tpl/images/0041/7108/b6554.png)
Now, the value of x-y is expressed as:
So,
is equivalent to (x-y).
Answer 2:
It is given that the sum of infinite geometric series with first term 'a' and common ratio r<1 =![\frac{a}{1-r}](/tpl/images/0041/7108/bb155.png)
Since, the sum of the given infinite geometric series = 200
Therefore,![\frac{a}{1-r}=200](/tpl/images/0041/7108/2da58.png)
Since, r=0.15 (given)
a=170
The nth term of geometric series is given by
.
So, second term of the series =
= ar
Second term =![170 \times 0.15](/tpl/images/0041/7108/84ded.png)
= 25.5
So, the second term of the geometric series is 25.5
Step-by-step explanation:
Ответ: