Fiona is mixing fertilizer with peat moss to add to her garden. The amount of fertilizer is proportional to the amount of peat moss. Fiona is mixing fertilizer with peat moss to add to her garden. The amount of fertilizer is proportional to the amount of peat moss.
Each 12 -lb bag of peat moss costs $4

Which equation shows the relationship between the number of pounds of peat moss Fiona buys, p, and her cost in dollars, c?

i think it is c hope that

let x and 400 - x be the two numbers.  

==> 0.80x + 0.85(400 - x) = 400 - 68 from the statement of the problem.  

< ==> 0.80x + 0.85(400 - x) = 400 - 68  

==> 340 - 0.05x = 332  

< ==> -0.05x = -8 ==> x = 160, the first number ==> 400 - x = 240, the second number.

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 !