MATH
posted by Help!! .
the first number of a sequence is 200. every number of the sequence after the first is 100 less than twice the preceding number. what is the 5th number of the sequence

I'll get you started.
200, 300, 500
Take it from there. 
how is it 200, 300 when it says it is 100 less than twice the preceding number... isnt it 200100=100x2==200 again? im confused

100 less than _twice_ the preceeding number.
(200)*2 100 = 300
(300)*2 100 = 500
(500)*2 100 = ... et cetera