The two questions are here, they're probably easy but I'm having a brain freeze lol
http://img29.imageshack.us/img29/5626/file.png
The 4(c) sequence is 5, 7, 9, 11....
The 4(d) sequence is 5, -10, 20, -40.....
The two questions are here, they're probably easy but I'm having a brain freeze lol
http://img29.imageshack.us/img29/5626/file.png
The 4(c) sequence is 5, 7, 9, 11....
The 4(d) sequence is 5, -10, 20, -40.....
Hi brumby_3,
1st one
is an ARITHMETIC SEQUENCE.
To sum all the terms of the sequence, the sum is
which is the average value multiplied by the number of terms.
2nd one
The next term is the previous one multiplied by
This is a GEOMETRIC SEQUENCE.
The sum of these terms is
which is
where "a"=1st term, "r"=common ratio.