Ihave trouble with exponential functions, i have a story time in where i have to write an exponential function but the intial stocks account starts as 1000 and doubles every 7 years, how do i write an equation for that ?

part a

x     y

0     8

1     7.5

2     7

3     6.5

4     6

5     5.5  

for every hour i deducted .5 inches from the length of the candle

part b

it is a function because for every x value there is only one y value

part   c

for every x value there is only one y value

x       y

0       8

1       7.6

2       7.2

3       6.8

step-by-step explanation:

look at photo

the weight of the object inside the box!