During the month of february, fabulous feet shoe mart sold 30 pairs and sold 36 in march

10 - 8 = -2

  8 - 6 = -2

etc, so -2 is the common difference

step-by-step explanation:

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 !

we would need a picture of the quadrilateral in order to answer the question. also, it seems that the question is missing some components.