Find the range of f(x) = –2x – 5 for the domain {–2, –1, 1, 2}. {1, 3, 5, 7} {–1, –3, 3, 5} {–1, –3, 7, 9} {–1, –3, –7, –9}

answer:

at time x=0 we have 1000, at time x=1 we have 2000, at time x=2 we have 4000.  

so that's an initial value of 1000 and a ratio of 2,

y = 1000 (2^x)

hope this !