You can put this solution on YOUR website!
Since most of the terms are in "halves". Good way how to start this problem is by coverting the integers in it into halves.It's generally good to have 1 type of numbers in pronlem either integers or fractions etc...
So 3 = 3*2/2 and 8= 8*2/2 , thus 3 = 6/2 and 8 = 16/2 and we get 1/2 , 6/2 , 11/2 , 16/2 , 21/2 ...Easy to see that every numerator is increased by 5.
It is arithmetic sequence. Formula for n-th term of arithmetic sequence is
where d is increment you want to add each time.
We can write :
Concerning your second problem I am quite sure you'll be able to finish it yourself. Good luck!