Can someone tell me what are the 3 next numbers in the following series and explain how you figured it out? I'm absolutely horrible at math. Thanks in advance

A. 10, 12, 18, 28, 42,.
B. -5000, 1000, -200,.

First of all I'd like to point out that Algebra is an important subject. It helps teach your brain how to think. I will help you with the first one to help you along but you should try to figure the other one for yourself or the purpose of this will be pointless. Ok?

A. 10,12,18,28,42

First off, what's the difference between 10 and 12? 2
Then 12 and 18? 6
18 and 28? 10
28 and 42? 14

Now ask yourself what is happening. Each time the difference in numbers increases by 4
Therefore, if we add 4 to the difference of 14 we get 18.
Add that to the sequence number 42 and you have 60
Continue the same process, and the next number in sequence is 82
Then again and you have 108

A. 10,12,18,28,42,60,82,108.