Assuming that is 5x+40, Then your answer will be 15.
What model is he building
Hi!
Samuel bought the mixer for $54,205. The value of this (the prive) decreases every year at a costant rate (so, for example, it may decrease of $100 every year).
we are solving for t and we should keep in mind that we multiply the price for the function (1 - rate/100)^time
in f(t) you put the value of year 1 for example

Solving for r will bring us to the solution, and we can substitute 1 to t since we are calculating how much it decreases after ONE year.
We would divide for 54205 to cancel out that 54205 multiplicating the parenthesis.
Also, the x is given by the formula (vale2-value1)/value1 to see how much the price changes from year 1 to year 2
We will get

Again, it would be:
f(t) = 54205(0.13)^1
Since Tim's stamps are 5 times as many, set up the equation:
1038=5s+1s
1038/6=173=s
Ryli has 173 stamps, and Tim has 865.
Subtract 173 from 865 and you get 692 stamps more.
I would say zero because the other strings wouldn’t be able to touch it