Firstly, let's create a function of f(t) where t represents the time that has past, and f(t) represents the amount of rainwater. We know that when t=1, then f(t)=10, and t=2 then f(t)=15. So, let's take that and analyze it:
(1,10)
(2,15)
m = (15-10)/(2-1) = 5
y-intercept = 5
∴ f(t) = 5t+5
Now we just evaluate t for 10:
f(10) = (5*10)+5
f(10) = 55
Think it's B or A if they want it simplified.
Yes u are correct x is 10
Cost/ ounce
16 ounce $1 16 ounce
_________ × _________ = __________ ≈ 19 ¢ per ounce
$ 3.20 100 ¢ 320
