Three trains - one eastbound, one westbound, and one northbound - leave a city at the same time.
The speed of the northbound train is 20 miles per hour greater than the speed of the eastbound train.
After 9 hours, the distance between the westbound train and the eastbound train is 990 miles.

idk man good luck man

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 !

i think it will be 4feet long of what i comprehend

given the equation is 8+9z=-6, the first step would be to subtract the 8 from both sides:

8+9z-8=-6-8

since 8 minus 8 = 0, this would cancel out the 8. and since -6 minus 8 equals -14, the equation would look like this

9z = -14