wich expression defines the given series for seven terms? 8+13+18+.......
you're just adding 5
example
8+5= 13
13+5=18
18+5=23
23+5=28
28+5=33
and so on :)
Answer: a+6d will defines the series for seven terms i.e. 38.
Step-by-step explanation:
Since we have given that
\(8+13+18+......\)
Here, a = first term = 8
d = common difference is given by
\(a_2-a_1\\\\=13-8\\\\=5\)
So, we need to find the seven terms:
So, here n = 7
So, it becomes,
\(a_7=a+(n-1)d\\\\a_7=8+(7-1)5\\\\a_7=8+6\times 5\\\\a_7=8+30\\\\a_7=38\)
Hence, a+6d will defines the series for seven terms i.e. 38.